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LaserWriter Printers
Volume II

service Guide

LaserWriter Pro 600/630,
LaserWriter Select 300/310,
Personal LaserWriter 300

September 1993

©1993 Apple Computer, Inc. Apple, the Apple logo, AppleLink, AppleTalk,
LaserWriter, LocalTalk, Mac, and Macintosh are trademarks of Apple Computer, Inc.,
registered in the U.S. and other countries. AppleOrder, Finder, LaserWriter Select,
Macintosh Quadra, PhotoGrade, PowerBook, QuickDraw, System 7, and System 7.0 are
trademarks of Apple Computer, Inc.

Helvetica, Palatino, and Times are registered trademarks of Linotype Company. ITC
Avant Garde, ITC Bookman, ITC Garamond, ITC Zapf Chancery, and ITC Zapf Dingbats
are registered trademarks of International Typeface Corporation.

Cg ROSTSCRIPT is a trademark of Adobe Systems Incorporated, which may be
Software From Adobe
registered in certain jurisdictions.

No portions of this document may be reproduced in any form without the written
permission of Apple Computer, Inc.

Every effort has been made to ensure that the information in this manual is accurate.
Apple is not responsible for printing or clerical errors.

Table of Contents

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ASCE W Fie l Sale RUNES sas $7, ces acne lt faves ote ol serene canes oapenten aaa ucon attic 3
TOMER Al OLY certs ns deahcntid avatars areas tetehenin tian ayo eaRaesoem ara eta aemeS 3
EAS CLA LY ps cesevs acres gcse ce crac sca acta cage UU ea olan act a Prats taarlanaa Abs 3
FOL) PRE VSO RUNES 53, sane te ceca eect cee cess bas coal Mia teen ssoatasdhsus tna daSiaahen nahin aaa aR 5
Setting Up am ESD-Sate Workstation siaics access iieetennensdinannmauiaamanenns 6

General Information

Connecting the Printer (0a COMPULCEN -sdsisssscscdssentsssvsnvansnesnisveritvasnenbnaaiarassbnsiasinnnineinmndinenn mene 8
Connecting via-a Peripheral-3: Gable ssisssiscsceacsseanisyceesadale sats siesennecsoreiavatadl cnrasiutaennseubinteinentstve 8
Connecting vid EOcal alle CA eS ap cs ass csveasnttavaninasicuitasdalgecioteitenasnatestoetnpancsanianseeleadatammane: 8
Connecting via a Centronics Parallel Cable ......c..ccccesssessessessessesecseeesseceenectesseesecteseeneenseneenen 10

GADle COMME COR :o.lacsierncaesteecterietaatneianiintetcaicenanaa salen diet manta taunt: 11

PRATER COMME CIONS vio .ctwiiaaiinncettninseneihietaninestainalaie nt aN aaa 12

PRHGGE PMO UUS sconce eceeersim stsiatigdalar mitts tance nesceade evans sani datadat vasassdiee uaswee veuereuonteanammadallt 13

SWVC HD: St SS a tas cesane came Vea ced le Sea arama adsense ta lene ene eared ats 19

A POUDICS HOO UIC TifS erat viaa reeset ceeatsssestans sued tues cirtena lay ueama taanid snc aeaiwaaaaeinieastdgualensemiaiuens eet 20
Telephone and On-Site Quick CHECKS issssiondsiessisdsessevscsiumincanmonotetvnmaurlndaderninanae 20
ITylie) geurlate Mec listaul (leone ere erent eee nrernnnrr tence Tren errr ete ese metre terrae rrr ert 21
PLONE Ty Lem Ci CATON seca lnc rssh us apse ausae saute ee hens taster afeesneatacnapeasetoMiphanmnaenseeds 21
DOrtWare | rOUDIeS MOOT asc seaitonattiscauos eoasussmueiacsccestuds nin iccenenel sabiadiaesausaa tcliceceaitiedleseic 22
HARA Ware, PTOUDIES MOO EI Dj tecscsassvedi ceansnitbsv auniieelia bronuckipounitaitvavosaneibvapeae ves dinensiaveeaveneitssiee 24

LaserWriter Pro 600/630

Exploded View = Main Printer stasas.0.c5tocnaicaonvatarrn an ancaednee Mirctatieeievaniantneaneniie: 26
VIAL RECO E PArtS La SE ste ceva’ vreau eicnazeeset cvs eel venice dubai estan aoaxeneah outer eaten memnencmotaas 2/
EXplOGed: VieW=ENVEIO De F CCE iar steusntucscncssscirt seat cverinnncctanaaienl nodal macannnultisnmtanan: 31
BAvelope Feet PAS LIS tees sagecsctisiescasteeesteaesh aes ace hn sce esniedetly aia niaeeota nadie eserias 32
Exploceg: VieW =Sheel FeCGEr 2 eicanaiuatoasunessiuielalun aiuiaqtimiamnebcnaen ula 33
Siicel Feeder Parts List nciitaaeananrddnuecincarenielidsuinantl eid icaiansaidalventets 34
Boards and RAM SIMM Configuration Guidelines ........cccsesssssssessessesesesesesssnsaesresssseeseessenes 35
SE CUICAMON Se os tstesh art cues lessaessact we aauotben Uh luton seadol ies Paarl auaigtantenltelynee mamaanelaiinpcekablniisand 36
BEIT A SIOS UC aes scartscansuteunsiadLeaav cee nserhatioachoisealehucwenand ain luce ves suciantaa aeraavea xdoupstan asa eat aiedadsnet 38
TESEANGCONMOULATOM: PAGES satestuda saturn eatantnua ebasaieceations nied eaanauatauanssbannseseluayer eons etdioue 40
Troubleshooting the LaserWriter Pro 600/630 .....cc.ccsscssssssessesseessesestsssessecseeseesesrssseeseeseeseersesneaees 42

PEC VOWEL OM CHECK IISE sssezsczisesresedasewusce caletststut cede tpn supa sata sda aassaastatst nah testo 42

TTOUBESMOOLIME TDS jaiitaveigatyeaecscasdnstubanteecdteaatee etiam teatadeel Mean dase Onainamareaee 43

DMSO OV SLC IN a tists vatenesultuensscertstetsnel iam tantanetaeel tatistaneiNandodaemaauatal oamueten nus 47

LaserWriter Pro 600/630 Troubleshooting FlOWChafrt........c..ccccscsseesessesecseeseeseestessesseeseeseeree 48

LaserWriter Printers, Vol. 2

TOUBIESIMOO MS LADIES, 2: cscs. cseparsasitestscaiceiamnactatin te sire esa snipes cerisl nace ats neg 50

Table 1—-Fan Does Not Come On When You Start Up the Printer... cece 50
Table 2—All LEDs Are Off After Printer Warmup ..........ccccsscseesteseeeeseesessessteeneeseneneene 50
Table 3-Toner LED Is On After Printer Warmup...........cccccseiseeessiesteseseesieeeeeeeenees 52
Table 4—Paper-Out LED Is On After Printer Warmup.......cccceeceiseeeeseeieeneeeeeees 53
Table 5—Jam LED Is On After Printer Warmup .........cccccccssssessstssesteseseetenersetssesneteseeneate 54
Table G=E USC PASSE Maly, TON cess castisses ah cxoroushtnaan annus tacinctivan duel teneatnenetacs tee tades: 55
Tale 7 LASS Hy) SCANNED HIN OR aisucac coer \araecnayaesysttastates tat eae eel etuplaeantouneinlesabieaunnioeonateaakcatatn By
MADE O= Mai MOTOR HOM ic2oe5% siasaeca sa eae tart veaspenel aside tad anveentiobeesuoistnnmnadsnerngemeineann 57
TAINS Beats BR OR sc tciaresssi clas vases h apap ea engin tin un scaseohaes a atom amstansetonluetadenietambnenaiuadls 58
Table 10-I/O Board or Component Errors .......ccsecccessesseescessneesesesssnesscetsncarentensneeventanes 58
Tab es AlE Blan PAGC icc23 easinnicontienss-enenaeins visas essence ymin uaiuaets ateanale annanen ee aNee ITE 60
TAI: V2 AME BIAC: PAGE assez ueseass ta cbicrsanys tied soups nied seia Ae aesnareaulgeaadouamnesgapaulionanceee 61
Table 13—Uniformly Light/Faded Image Over Entire Page .....c.ccccessesseeeeeseseeseen 62
Table 14-Uniformly Dark Image Over Entire Page ........cccccccseseseeeseseeeeeeenen 63
Table 15—Black Vertical Lines, Sharp and Well-Defined.......... cece 64
Table 16—White Vertical Lines, Sharp and Well-Defined........cccccccsseseseseeesneeeeneen 64
Table 17—Black Horizontal Lines, Sharp and Well-Defined ......0.c.ccccecesessteeeeeeeee 65
TADIe 18 = BAG RECISTEALION sisi deswsossaseadtucsiivaasuitnid tives nodetet iittala ccalatdeeaaceauel 65
Table 19—Stairstepping/Vertical Lines Jagged or Shaky... 66
Table 20—Vertical Elongation or Foreshortening ........ccccsccssesesesecessecsessneesnesneesneanes 66
TAU BAC. FU SIN Oises cers cxsasi sistant hanced cae ee gnanenenenmnneeyaeesl 67
Table 22—Blank Spots/Random Pattern Of LOCAtiON .....eeeeeeseestesteseesteeneetereenteseeeen 67
Table:23— Tomer Ons Back Of PaGe iicesticctchasaavale tial sha totdationiatusuncntoraania ticoiaaueonaauyinen 67
Table 24—Cannot Print in PhotoGrade/600 dpi... 68
TA DIG 2 SRE PE LITIVE IE IC CIS ets atcracaassthtveraycaasserteaib ucts siendsoualecaspele idler lievaaalejuaeasnensar 69
Table'26—Printer Picking Up From Wrong SOULCE satsicscssidcvisctunantiarriatindensalanenns 69
Table 27—No Pickup From Envelope Feeder ........cccccsecesseestesseesiseeneensessenteneneeneeneees 71
Table 28—No Pickup From Multipurpose Tray .......cccccscssseseseesnesesessesseseeseeneeesne 72
Table 29—No Pickup From Standard Cassette ......c.cccccsecessesseesseeeneseseessessenseneseeeensnes 73
Taple $0=No Pickup From: LOWer Cassette scbessictacaisnsacusheassesansstenanisscavnedsateanntaazonaaiuilnn 1
Table 31—Leading Edge of Jammed Paper Is in Fuser/Delivery Area... cece 76
Table 32—Leading Edge of Jammed Paper Is in Pickup/Transfer Area... 77]

Table 33—Paper Jams in Pickup/Transfer Area When Feeding From the
SLAINGALC CASS CULE caaaessasunasnletertaiunatseatdnanes ste ey nateadebundnaeeunaiaitaeeymannets 78

Table 34-Paper Jams in Pickup/Transfer Area When Feeding From the
MUI OU OSE TAY acetone saiaeanndens ese tc sacancheatatiasnsa tea dims teseatantaneneateeaimitee tans 78

Table 35—Paper Jams in Pickup/Transfer Area When Feeding From the
OPUONMAl SNEEE RCC CSL rsacm ai castiinssturns aacisdstunediaste satan seal liaeiitectsareinaiastiade 79

Table 36—Paper Jams in Pickup/Transfer Area When Feeding From the
BNVCIODE FCCUCH siainuriiematausenasnenusGnan waicatent ane eamauraa nae 80
bgt Veh ogd Brea v2) 4) Reerermeerereey tere acne perce erreeey reer er terme erty ene ree er tr ere een yer ere eT 81

li Table of Contents

LaserWriter Select 300/310

EXDIOGEG View siiauaranienmienam centennial ma naMO es 84
PAAIUS, LAS sides asicecastentocvcs nserats sss odsesenecnsnesdes ests os waa ce feet cad eae me Alena ec eee toss 86
TO) BOATS tices sssnsees severe ccmeaucnscoused osastacs ti achamua auaaae gestae Muted Nein hte eanaa anced mali 89
SS CL CAGI ONS ie asacoaa cand eae hacos case vecsesai ire ected ncaa ol umisaws Saneeesauan ad natartigmeneteloowslaeediinalaniied 90
SO EACUIS LTE DIS ceases suse cseeauan peso areata ees asmontaele dae caea taaon eer pened eetiodneneeeaia tm eeem eatin? 92
DEVICES FSU PAO eos dined cis coos nea rs antisieua agua tn tgneaian mnie sahara deni ued anleremtettts 93
BA yes auaces ae ecco ectue seus tscas errr ae ne aunt seamen ee une amet 96
Troubleshooting the LaserWriter Select 300/310... cscseeestesteeseeseeneseeeeesssseessnesesseaneens 97
PEe-POWEF-OM CIES I csicainseidsseuseateas ante hsaxaseaate nn tuhaeaanateny ark inauntea dana eemenat ivan 97
THOUBIES OOUNG: PEE APA NOM ape cizenianstct didaasch iitencea ciessinecaes ec ctagedun sodas aSosnsupareast tana toeetaD 98
LaserWriter Select 300 Troubleshooting Flowchart .........cccsesessessecseeesenseseeseeeeenseeaneanes 99
LaserWriter Select 310 Troubleshooting FlOWChartS «00... .cccsceseessesestesresteseeneeneeeeneeeeennee 102
TOUDIESNOOLING TADles sisiscsctiasarizasttrraasule in ccetensrancceeseataerd meta My case umieneananmeaes: 106
Table T= Main. Motor: Faihire wxaasesscaivs 2c visthatastacaccnitawonen lene oka aaaares 106
Table:2=N6 POWErtO Fain: Gatetivmngiateniend hanes entrain naian ne 107

Table 3—Fusér Assembly Fail ire tssceaceicss faiaaviacsacresiartianaiansdustasianmalemnmues 108

Table 4—Laser Scanner Failure .......c..ceesccseesseeeestecseeenseeneesnes side Pabees ta aaelagan ec aneie 110

Table 5—Scanner Assembly Faure sssscccuscsetanaiigeiueiwhemaiatumibatunmanmides 111

Table 6—Select 300 1/O Board Error cseieiecststsctvasesicsntsnssertsplesotiienyessisesdiveeniononwoan 111

Table 7—Select 310 I/O Board Error—Serial COMNECHON 00... eceeeeteeeseeseeesnesnerteees 112

Table 8—Select 310 I/O Board Error—Parallel Connection .......ccceceseeseeteseseeseseseeeenes 112

Table 9-Temperature Sensor Assembly Failure .........c.ccccessesessesseeseeseeesseenseneeneeneensens 113
Table-10—Toner Cartridge Sensor Failure ia sictiaisstsensay niece dincmancntotentansecdaias 113

Table 11—Power Supply Failure (+24 VDC) oo... ececeesesseeseeseesesteenesssesecesteeeeneeneenes 114

Table 12—Power Supply Failure-(+65 VDC) ssiiinvectinicwamindauuniameinnnns 115

Table 13—Paper-Out LED Lights When There Is Paper ou... .eecessessesseseteceeesseeereeneens 115

Table 14—Paper-Jam LED Lights But No Jam Has Occurred .......cccscssessecsestesteeteseeeees 116

Table 15=All-Blank Pave Aascueitncdu anaconda eaaitianan nena 120

Table 162 All BACK PAO 6 a.cuSvecinsudiintsnstanatcesdeeniladdni sta iancteattatyuiesastastinenastaanana nna 121

PAD Ie 7 LiSh/ Faded IMAGE aucesashennneatiat nan iuniaiadeetndn a manennimeitanentulatenin 122

Table 1e—Datk Image Over Entite Page ss. coicbcdisuecnissortaneoniittapiecananiont eine avon 123

PADI TO BlACK V CrtiCal LIMES iasusaicens tas isnstcoisssliearallanasteteetawoseusel ervataaunucamoutics tenis 124

LANG ZO Winite V SLI Call LANES xcs tes cusatiescinynnaciadin enous turntesniceatiaredoruisbhdesstoashtcoianit 124

dT alohe 2 T= BlaC ke OM Z OMAN iS aa decevc seseuoe te cainscaei ae ceadoelaaie Musk parte teruetatbet aga 125

Table 22=W ite HOMZOMIAl NGS acesscneietimcttsicnmnie etnies niin aualdanatiavets 126

TAIE 25 GNOSEING sissks te mscncces agers cdnde vadete caus aceasta uneven aesungian earned nea ean 128

TADS 24 BAC FO SUNG reece eet tceecmearrast acct cncatusain taaiai ae deals cea lense bende ania 129

Table 25—Blank Spots/Random Pattern Or LOCAtiON oc eseeescestesteseeesteceeseeesneeeeneenen 129

Table 26—T omer Om Back Of Pape ars eac-cecarailtvanenicnacian ibaa ier deicandsitemmieaaiaee 130

Table 27—Paper Jams in Fuser/Delivery Area .......cccsceecssssseseesstessesteecssseeneeeeerteneenen 131

Table 28—Paper Jams in Paper Pickup ALe4......cccccessssssesesesteseetesessseeseereseaneneeseneetenen 132

LaserWriter Printers, Vol. 2 ili

Table 29=No Paper Pickup FLOM CASSClt © iacvssshes.cceaxsovivrnvvesassasmunasoasoeniativon gtiaeies totais 134
Table 30—No Paper Pickup From Manual Feed or Multipurpose Tray... cee 136
WHATS DA ON A I cao est rcees ace an ase apnavatieduattactncaasasecae ay ceed tated aust eacams aceon anteater tiads 137

Personal LaserWriter 300

5046) (6:0 fof) [exe De Re etn MPEN CON et OTe rrr rt TY RPT Oram eo eer nT ere te ter or 140
PIES Et Sh ee aaceschiseesssiach ce occa arsseg cecvutess Tease coo pease austen Roo Ue No eludes ae ener ced 141
VO-and Controller: Assembly Boards ise, cce-cesssssrrteia acerca epee nu ua tanner cteiacaewa decades 143
SVE CLT CALL ONLS icicle scactttaras cease pecencencea eae shade eT eet cree teeta ated nananiaraeing 144
BME US LTS 1S costs a atest od catia unease pn ara a ascents arama aaeeesnee 146
PASI PAN Sie a tateiessaeaek cnasiettcg otc asia veaceinaacon totais aicea asa raclo a ueaateas cao danucetuctases 147
DCM SIME SY SUCIN sepien ts. Sa, fesctatesssdeanen cs tleeet teas isnt late anqenss talon da puna teat uletuud meses tne ae 148
DEVIC C MSU PAE a seats tyoctsea anit ywrin meimaenaina timaenran ak caesarean Geren rane ena 149
Ai STR @ ee sv@l (UGS 600 \0| eer rne ne meee tet te sr oame Ont Maren tne oti mer anre eT free are reer Creare ee arrestee 151
REOiS ALO NCSL MI CINE ias edecear con tua epescvayheoleiccsnerass uacesorsas tea oaseiaaeanla alga deomamrenneneearetanas 154
Troubleshooting the Personal LaserWriter 300.0... .cccccsecessesesesseessesesteseeteseensseeeeeeeeeeneeneeeens 156
Pre: POW CLO: COCK IIS asia sl acsreie acne dee ata sons eh eadapad Souda dubalateala haan Ohajate 156
TOUS OCIS IIS satis stot cnt ebaaa ellen Gea ated ussite linseed Dagiaite 157
Personal LaserWriter 300 Troubleshooting FlOWChart .........cccsessessecseeteeteeteeteeteenesteeneeneenen 159
PrOuDlesMOOtAg: VAIES.,s2.42.si tod cascwte statin iat cutbadinieaabieai ai ntndaninaumenseneinetelas 162
TAdle JNO POWEr 10 Fats Auscrviaciosania run recmanind nasi asgne niece see eaenelons 162

Tale 2a Main MOLOR FAINT: tex casestecscaasaxs estaesee sya tastecsaanaenerisuiaben vactuluasoneantesstsae shee 163

Taple 3=No-Paper Pickup from Cassette: (ray wnisianssitinisinnusn inmate 164

Table 4—No Paper Pickup From Manual-Feed Slot........cccccscsesesesessesneeeneeneneneeen 165

Table 5—Paper Jams in Pickup/Transfer Area ......ccsescesseeesteseeeeseeseestesteeseereesneeneeneenee 166

Table 6—Paper Jams in Fuser/Delivery Area ......c.cccssessseestestesecseeseessseeneeseesneeeeneenee 167

Table 7 All Batnk PAG essex ceiaidstos acre reeaettns erste name caveopuninsarveh tear esnioaan euuaguangninosendvaleantiats 169

Maple’ SAMBA CK PACS usinzeditiacascsatsneacyasnaeeecuas aces venalean dean dnesa iio iin san eanoinyoumaalawanapuucenert 169

Table 9—Uniformly Light/Faded Image Over Entire Page oo... ccceessesseeeeetesneneeneeneens 170

Table 10—Uniformly Dark Image Over Entire Page ........cciccecccsessesteeseeseeteseeteceeneeeseeees 171

Table 11—Black Vertical Lines, Sharp and Well-Defined........c.ccccceceeesteseseeseereeeees 171

Table 12—White Vertical Lines, Sharp and Well-Defined.......ccccecceecesteeeteeeeseenees 172

Table 13—Vertical Banding, Irregular and Smudged Black LineS...........ccceeeeeetees 172

Table 14—Stairstepping/Vertical Lines Jagged Or Shaky .....c.cccsescessestesecesesnesnesssnerseees 173

Table 15—Horizontal Banding, Evenly Spaced Smudged Black Lines occ 173

Table 16—Black Horizontal Lines, Sharp and Well-Defined ........cccccscsssssesteeeneeee 174

ADI E 1 STA REGIS CATION, oe ecaot evs is evnsus peach ateces dit etetegvednanin ve ial eauemnan avaranauacncumuocsstis 174

ADICTS SKC WAP ii sciatic sate aas Late attalan apnoea au laroen adtaanae tesa une eed 175

lo) Ke Le oe (60 LUG) | 0) 2 arene renee nnU ee Oger eae ee tennrn rc rer vere Op Tin femcttnn errr enter 175

Table 20=Toner On: Back OF Page isiaicsnteiensiniatigeuWdensiininaaimmivieanneaee 176

Table 21—Blank Spots, Random Pattern Or LOCatiON.......cccecsessesessessestsseeseetesterneseeneens 176

WACO DIA SAIN chtarisa vexdlaisas arcarssencnatyteeneraats ara ettes ees? elec sue uaies phe Sea Cin Gea ve ea naleama te udlasteneieath 177

iv Table of Contents

Introduction

Important

The Apple Service Guide for LaserWriter Printers, Volume 2, is designed to
help Apple-certified technicians troubleshoot and repair Apple laser printers at
the customer's site. This guide includes service information for the
LaserWriter Pro 600/630, LaserWriter Select 300/310, and Personal LaserWriter
300 printers.

The Apple Service Guide for LaserWriter Printers presents information from
the Service Source CD and other Service publications in a booklet format that
is easy to use and easy to carry. The guide includes only information that
experienced technicians need to service LaserWriter printers quickly and
reliably at the customer’s site.

Using the Guide

The Apple Service Guide for LaserWriter Printers contains safety information
and four tab sections:

Tab 1: — General Information

Tab 2: — LaserWriter Pro 600/630
Tab 3: — LaserWriter Select 300/310
Tab 4: Personal LaserWriter 300

Safety: This section includes safety warnings, practices, and procedures. You
should be completely familiar with all the safety information before using this
guide. Please read this section.

Tab_1 — General Information: This tab section contains general printer
connection information, port pinouts, and generic troubleshooting tips that
apply to more than one of the printer families covered in this guide.

Tabs 2-4: The three LaserWriter printer tab sections contain information
specific to particular LaserWriter printer models:

¢ — Exploded-view drawings of the LaserWriter printers
¢ Alphabetical parts lists with part numbers

e — System specifications

¢ Troubleshooting information, flowcharts, and tables

When ordering a replacement module or spare part, be sure to check
the part number given in this guide against the current information
in the AppleOrder™ system, on the AppleLink® network, or in the
Apple Service Price Pages. Remember that this Apple Service Guide is
not updated on a regular basis.

LaserWriter Printers, Vol. 2 1

Safety

A Warning

The LaserWriter printers operate at high voltages. To prevent
serious injury, always switch off the printer and unplug the AC
power cord before servicing the printer. __

Never disconnect the beam-detect cabling or laser shutter when
the printer is switched on. The reflected laser beam, although
invisible, can permanently damage your eyes. _

The fuser assembly becomes very hot during printer operation.
Before servicing the fuser assembly, switch off the printer for at
least 5 minutes to allow the fuser assembly tocool. =

sensitive microcircuits. LaserWriter I/O boards contain CMOS
components, among the most sensitive chips in use today. CMOS
chips, ROMs, and SIMMs are very susceptible to ESD and skin
acid damage. To prevent damage to these components, handle
them only by the edges.

Make sure that you are not grounded when
¢ You are working on plugged-in equipment
$ You are performing live adjustments

The LaserWriter printers are heavy. When lifting or moving the
Peter VCC ren nol yea youl

Introduction and Safety

LaserWriter Safety Rules

1. Remove all jewelry before performing repairs on a LaserWriter
printer. Removing these conductors reduces the possibility of electric
shock.

2. Before servicing a LaserWriter, turn off the power and disconnect
the AC power cord. Certain parts of the printer are hot (electrified)
when the printer is under power. Never work on a LaserWriter printer
under power except when making live adjustments.

3. Do not touch the following modules when the LaserWriter is
powered on and the covers are removed:

¢ The high-voltage power supply

¢ The DC power supply

¢ The power supply block

¢ The high-voltage contact assembly
e The power supply unit

Toner Safety

Toner is a nontoxic substance composed of plastic, iron, and a small amount of
pigment. Skin and clothing are best cleaned by removing as much toner as
possible with a dry tissue, then washing with cold water. Hot water causes
toner to jell and permanently fuse into clothing. Toner attacks vinyl materials,
so avoid contact with vinyl.

Laser Safety

When servicing the optical system of the LaserWriter, be careful not to place
screwdrivers or other shiny objects in the path of the laser beam. The
reflected laser beam, though invisible, can permanently damage your eyes.

Never remove the cover of a laser/scanner assembly, whether the printer is
powered on or not.

Because the laser beam is invisible, the labels shown in the following figure are

attached to the insides of covers where there is danger of exposure to laser
radiation.

LaserWriter Printers, Vol. 2 3

Table 15 Black Vertical Lines, Sharp and Well-Defined

Check Result

Action

Try a known-good toner cartridge. No
Does the problem persist?

Problem solved.

Run the printer diagnostic. Does the
diagnostic test indicate a specific
error?

Go to the appropriate
table, as indicated in
Figure 7.

Does the symptom definitely occur on
a service test page?

Replace the I/O board.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

e Replace the fuser
assembly.

e Replace the
laser/scanner assembly.

Table 16 White Vertical Lines, Sharp and Well-Defined

Check Result

Action

Try a known-good toner cartridge. No
Does the problem persist?

Problem solved.

Is there a hair or other obstruction
that can be blocking the laser beam?

Run the printer diagnostic test (see
“Printer Diagnostic"). Does the test
indicate a specific error?

Remove the obstruction.

Go to the appropriate
table, as indicated in
Figure 7.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
¢ Replace the
laser/scanner assembly.
e Replace the I/O board.

LaserWriter Pro 600/630

A Warning

ESD Prevention Rules

Follow these steps to reduce the risk of electrostatic discharge (ESD) damage
to equipment:

Before working on any device containing a printed circuit, ground
yourself and your equipment to an earth or building ground. Use a
grounded conductive workbench mat and a grounding wriststrap, and
ground your equipment to the mat.

Make sure that you are not grounded when
¢ You are working on plugged-in equipment
¢ You are performing live adjustments

Do not touch anybody who is working on integrated circuits. You could
“zap” the equipment through the technician—even if the technician is
grounded.

Use static-shielding bags for boards and chips during storage,
transportation, and handling. Leave all Apple replacement modules in
their ESD-safe packaging until you need them.

Handle all ICs by the body, not the leads. Also, do not touch the edge
connectors or exposed circuitry on boards or cards.

Do not wear polyester clothing or bring plastic, vinyl, or styrofoam into
the work environment. The electrostatic field around these
nonconductors cannot be removed.

Never place components on any metal surface. Use antistatic,
conductive, or foam rubber mats.

If possible, keep the humidity in the service area between 70% and 90%,
and use an ion generator. Charge levels are reduced (but not eliminated)
in high-humidity environments and in areas where an ion generator is
routinely used.

If an ESD pad/workstation (see Setting Up an ESD-Safe Workstation) is
not available, touch bare metal on the power supply to discharge
electrostatic charges.

LaserWriter Printers, Vol. 2 5

Setting Up an ESD-Safe Workstation

You need the following materials to set up an ESD-safe workstation:

Conductive workbench mat, with grounding cord
Wriststrap, with built-in 1-megohm resistor and ground cord
Equipment grounding cord, with alligator clips
Ground/polarity tester

Setup Procedure

Remove all ESD hazards from the area. Nonconductive materials (see
rule 5 under ESD Prevention Rules) cannot be grounded. Such materials
retain charges for hours and even days.

Use a ground/polarity tester to verify proper grounding of the power
outlet. If the outlet is wired incorrectly, most testers show a light pattern
that matches a code given on the tester. If the tester does not verify
proper grounding, move to another outlet that is safe.

Connect the grounding cord of the workbench mat to ground.

Use a wriststrap grounding cord. Fasten it to the workbench mat and to
the wriststrap. The wriststrap should touch your skin. You need the
continuous grounding provided by a grounding wriststrap.

Finally, ground the equipment you are working on. Use alligator clips

and a grounding cord to attach any metal part of the device you are
working on to the grounded workbench mat.

Introduction and Safety

beat hat te eg

General

Information

Connecting the Printer to
a Computer

Cable Connectors

Printer Connectors

Printer Pinouts

Switch Settings

Troubleshooting Tips
Telephone and On-Site

Quick Checks

Information Gathering
Problem Identification

20
21
21

Software Troubleshooting 22
Hardware Troubleshooting 24

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Connecting the Printer to a Computer

Note

You will find it useful to connect the printer to a computer in order to test the
printer, especially the operation of the I/O board.

Following are instructions on how to connect the printer to a Macintosh
computer using a peripheral-8 or LocalTalk cable and to an MS-DOS computer
using a 36-pin Centronics cable.

For information on how to install the appropriate printer software, refer to the
printer's user manual.

Connecting via a Peripheral-8 Cable

The LaserWriter Pro 600/630, LaserWriter Select 300/310, and Personal
LaserWriter 300 printers can be connected to a Macintosh computer by
attaching a peripheral-8 cable to the mini DIN-8 port on the printer.

Switch off the printer and the Macintosh computer.
2. Attach one end of the peripheral-8 cable to the printer port or modem
port on the Macintosh computer.

If you plug the printer cable into the printer port, you must make sure
that AppleTalk is inactive in the Macintosh Chooser desk accessory.

3. Attach the other end of the cable to the mini DIN-8 port on the back of
the printer.

LaserWriter Select 310 only: Do not connect the LaserWriter Select 310 to
both a Macintosh and an IBM PC or compatible computer at the same time.
Although this does not harm the printer, you cannot use the Macintosh (serial)
port while the PC (parallel) port is connected, or vice versa.

Connecting via LocalTalk Cables (LaserWriter Pro
600/630 only)

The LaserWriter Pro 600/630 printers can be connected to a Macintosh
computer by attaching a LocalTalk cable to the mini DIN-8 port on the printer.

1. Switch off the LaserWriter Pro and the Macintosh computer.

2. Connect a LocalTalk connector box to the mini DIN-8 port on the
LaserWriter Pro (see Figure 1).

3. Connect a LocalTalk connector box to the printer port on the Macintosh
computer (see Figure 1).

4, Connect the two connector boxes with a LocalTalk cable (see
Figure 1).

General Information

5. Switch on the LaserWriter Pro and wait for the startup test page.
6. Click the LaserWriter icon to select the device type and select the
LaserWriter name when it appears.
7. Choose Print Directory from the File menu.
e Ifa printout of the directory is produced, the printer and network
are functioning properly.
¢ Ifa printout of the directory is not produced, refer to the
appropriate troubleshooting flowcharts or table in the LaserWriter
Pro tab section.

Attach a connector box to the mini DIN-8
port on the LaserWriter Pro printer.

Attach a connector
box to the printer port
on the Macintosh.

AAA

LocalTalk

LocalTalk 2-Meter Connector Box
i Connector Box LocalTalk Cable

Attach the 2-meter LocalTalk cable between the connector boxes.
(Each connector box has two identical ports; you can use either one.)

Figure 1 LocalTalk Connection

LaserWriter Printers, Vol. 2 9

Note

Attach the cable to the parallel port on
your computer. (Your computer’s parallel
port may be in a different location.)

Connecting via a Centronics Parallel Cable (LaserWriter.
Pro 600/630 and LaserWriter Select 310 only)

The LaserWriter Pro 600/630 and LaserWriter Select 310 printers offer a
Centronics parallel port for connection to MS-DOS computers. This
connection requires a cable with a 36-pin Centronics-type connector on one
end and an appropriate connector on the other end for the specific MS-DOS
computer. (Most IBM PCs and compatible computers require a 25-pin
connector.)

Do not connect the LaserWriter Select 310 printer to both a Macintosh and an
IBM PC or compatible computer at the same time. Although this does not
harm the printer, you cannot use the Macintosh (serial) port while the PC
(parallel) port is connected, or vice versa.

Before you can attach the cable, you must remove the plastic static-protection
cover from the printer's parallel port.

Do not remove the plastic cover from the parallel port unless you need to
attach a parallel cable to the port. The cover protects the printer from possible
damage by static electricity.

To secure the parallel
connector to the printer,
use the spring clips.

Attach the cable’s 36-pin
Centronics-type connector to this
port on the LaserWriter printer.

Parallel interface cable

Figure 2 Centronics Parallel Port Connection

General Information

Cable Connectors

The pin numbers shown in Figure 3 are for the connectors attached to the
ends of the LaserWriter peripheral cables, as viewed from the front of the
connector.
Mini DIN-8
7 Apple AAUI

DE-9

Centronics Parallel

Figure 3 Cable Connectors

LaserWriter Printers, Vol. 2 11

Printer Connectors

LaserWriter
Pro 600
Configuration RS-422 RS-232 Centronics
Switch (LocalTalk) (Serial) (Parallel)
LaserWriter
Pro 630
Configuration RS-422 RS-232 Centronics
Switch (LocalTalk) (Serial) (Parallel)
SCSI Ethernet
LaserWriter
Select 310
Centronics RS-422
(Parallel) (serial)
LaserWriter
Select 300
RS-422
(serial)
Personal
LaserWriter 300

RS-422
(serial)

Figure 4 External Connectors on the Printers

12 General Information

Printer Pinouts

re meio
a

Connector type: mini DIN-8 male

¢ The LaserWriter Pro needs only 2, 3, and 5, but a connected device may require the others. For
example, to exchange information with an MS-DOS computer using the DSR/DTR handshake, pins
6 (DSR) and 4 (DTR) on the RS-232 port of the LaserWriter Pro must be connected to their
counterparts on the MS-DOS computer.

LaserWriter Printers, Vol. 2 13

LaserWriter Pro 600/630 Pinouts — HDI-30 SCSI Connector
(Pins 1-15)

Signal Name Signal Description

SCSI-Mode/ SCSI disk mode enable signal

Data0/ Data bit O

Signal ground

Data1/ Data bit 1

Termpwr +5 volts termination power

Data bit 2

Data bit 3

Signal ground

Acknowledge

Signal ground
Signal ground

Signal ground

Data5/ Dat bit 5

Signal ground

* Termination power is not provided on the PowerBook 100.

14 General Information

LaserWriter Pro 600/630 Pinouts — HDI-30 SCSI Connector
(Pins 16-30)

Signal Description

Dat bit 6

Signal ground

Dat bit 7

Data parity
Signal ground
Request

Signal ground

23 BUSY/ Busy

cy | Conte

Connector: 30-pin high-density interconnect (HDI-30)

LaserWriter Printers, Vol. 2 15

LaserWriter Pro 630 Pinouts — Ethernet

Signal Name Signal Description

+12 volts @ 175 mA or +5 volts @ 420 mA

Data In circuit A

Data In circuit B

Voltage common

Control In circuit A

Control In circuit B

+5 volts (from host)

Secondary +5 volts (from host)

Data Out circuit A

Data Out circuit B

Secondary voltage common

Reserved
Reserved

Secondary +12 volts or +5 volts

Protective Gnd Protective ground

Connector type: Custom 14-pin .05-inch spaced ribbon

16 General Information

LaserWriter Pro 600/630 and Select 310 Pinouts — Parallel Port

Data parity

Control/data

Message

Select

Input/output

No connection

Signal ground

Connector type: TRW CINCH 57-30360 or equivalent

LaserWriter Printers, Vol. 2 17

LaserWriter Select 310 Pinouts — RS-232

Signal Description

Data Terminal Ready (output)

Data Set Ready (input)

RxD- Received Data -

Signal Ground

| 8 | NC | No omecton
Shield Protective Ground

18 General Information

Switch Settings

LaserWriter Pro 600/630 Switch Settings

* Not arbitrated for input

8-pin/RS-422
RS-232
Ethernet
Parallel

LaserWriter Printers, Vol. 2

LocalTalk
Serial
EtherTalk
Centronics

Serial
Serial
EtherTalk
Centronics

LocalTaik
Serial
EtherTalk
Centronics

LocalTalk
Serial
EtherTalk
Centronics

PostScript
PostScript
PostScript
PostScript

PostScript
HP PCL 4
PostScript
HP PCL 4

PostScript
PostScript
PostScript
PostScript

PostScript

PostScript
HP PCL 4

PostScript
PostScript
PostScript
PostScript

PostScript
HP PCL 4
PostScript
HP PCL 4

PostScript
PostScript
PostScript
PostScript

Troubleshooting Tips

The following diagram illustrates the overall approach you should use when
troubleshooting an Apple LaserWriter printer. You will find information about
each action in this section.

Perform Telephone and

Quick Checks On-Site Quick Checks

Duplicate problem and gather

Hardware :
information

vs
Software

Go over System and Application
Software Checklist

Perform Software Troubleshooting

Hardware
Troubleshooting

Perform Hardware Troubleshooting

Telephone and On-Site Quick Checks

Check the power source and power connection.

Check all cables and cable connections.

Confirm that the toner cartridge is installed and has toner.

Confirm that the paper cassette is installed and has paper.

Confirm that the LaserWriter access door is closed.

Check the status lights.

Check the print density adjustment.

Check the switch settings, if applicable.

Confirm whether the printer produces a user test page. (The LaserWriter
Pro 600/630 printers generate a user test page 2 to 3 minutes after you
switch on the printer, unless the function has been turned off with the
LaserWriter Utility. The Personal LaserWriter 300 and LaserWriter Select
300/310 printers do not produce a user test page.)

VNANNNANNNNSN

20 General Information

Note

Information Gathering

If quick checks do not identify the problem, try duplicating the problem and
gather as much information as possible, including the following:

e <A description of the problem (no power, unable to print from the
computer, print quality bad, paper jam)

e The operating condition and environment when the problem occurs
(model of computer and LaserWriter; whether printer is networked;
LaserWriter Driver version; system software and version; application
software and version)

e — Exactly what the customer is doing when the problem occurs

e What has been changed or added to the system if the problem only
appeared recently

e What the customer has done to fix the problem and the results

e Whether the problem is continuous or intermittent

e Whether the LaserWriter can print a user test page (if applicable)

Problem Identification

Using the information obtained from the customer or from on-site
observation, identify whether the problem resides in one of the following
functional areas—software, hardware, or network environment.

Network Environment

The problem is most likely a network problem if any of the following
conditions exists: |

e Two or more users on the network experience the same symptoms.

¢ — The printer successfully prints both a user test page and a service test page (if
applicable), and the computer and software are known-good.

e Users experience “poor performance” symptoms (for example, the
printer takes longer to print than before).

¢ The printer or other network devices have been moved from one
location to another.

To troubleshoot and repair network problems, refer to the Networking and
Communications Apple Service Guide.

Software Environment

The problem is most likely a software problem if any of the following
conditions exists:

LaserWriter Printers, Vol. 2 21

The printer successfully prints both a user test page and a service test
page, but does not print when connected to a computer (provided the
computer and network hardware components are known-good).

The user is attempting to print using pre-release, public-domain, or
untested software (applications, fonts or drivers).

The same problem occurs when the software is used with other known-
good LaserWriter printers.

Hardware Environment

The problem is most likely a hardware problem if any of the following
conditions exists:

The printer is unable to print a user or service test page (if applicable).
The printer shows obvious, physical signs of damage.

The printer emits unusual noises or smells.

The printer indicates a paper jam or paper-out condition.

The print quality of the test print is not acceptable.

The printer has no power.

Software Troubleshooting

If you suspect a software problem, follow these steps:

1.
Zs
of

Check the LaserWriter switch settings (if applicable).

Check the cables and cable connections.

Verify that the LaserWriter driver software is installed in the System
Folder using the Installer, and that the version number is current.

Open the Apple menu and select the Chooser.

Click the appropriate LaserWriter icon and verify that the printer is
selected.

Open the File menu and choose Print Directory or Print Window.

If a printout of the directory is produced, the printer and network are
functioning properly. Perform software checks as directed in the System
and Application Software Checklist section that follows.

If a printout of the directory is not produced, perform software checks as
directed in the System and Application Software Checklist section that
follows. If this approach does not fix the problem, your customer
probably has a hardware problem. Refer to the appropriate
troubleshooting flowcharts and tables later in this manual.

General Information

System and Application Software Checklist

When troubleshooting systems and application software, perform the
following checks:

“ Confirm whether the problem is peculiar to one application (try
replicating the problem using another application). If the
application is at fault, try the following:

Probiem Solutions

The message 1. Make sure application is installed on
“Application drive.

is busy or missing” 2. Launch application rather than
appears document. If application launches, it

is not corrupted.

Program 1. Contact vendor about program
incompatible update.

with system 2. Remove program from system.
software

Program corrupted 1. System crashes can corrupt the

program and the system
software. Trash the program.

2. Reinstall the program and system
software from original, locked disks.

Y Confirm whether the problem is with system software (try
booting from a floppy) or with multiple System Folders (use Find

File under the Apple menu).

Problem Solutions

Multiple system — Remove all system folders except

folders folder with the Macintosh icon on tt.

Corrupted system — Trash the old system software. Use

software Installer on original, locked system
software disks to install new system
software.

Important When replacing corrupted system software, avoid introducing new
problems—always use the Installer on the original system software disks.
If you remove the System folder before running the Installer, you will
need to replace any custom enhancements, such as fonts, sounds, etc.,
from the previous system folder on your customer’s system. Make copies
of your customer’s fonts and desk accessories before running the
Installer.

LaserWriter Printers, Vol. 2 23

Hardware Troubleshooting — oo

If you suspect you have a printer hardware problem, refer to the
troubleshooting flowcharts and tables in the appropriate printer tab section in
this manual.

General Information

Laser Writer Pro
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Exploded View—Main Printer 26

Main Printer Parts List 27
Exploded View—Envelope
Feeder 31

Envelope Feeder Parts List 32
Exploded View—Sheet

Feeder 33
Sheet Feeder Parts List 34
Boards and RAM SIMM

Configuration Guidelines 35
Specifications 36
Printer Diagnostic 38
Test and Configuration Pages 40
Troubleshooting the

LaserWriter Pro 600/630 42
Wiring Diagram 81

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Cover
Liner

I/O Shield

I/O Board
Delivery
Roller
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Delivery/
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Sensor
Laser/ -~~ DC Controller
Scanner Board
Assembly Main Motor Right
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Connecting tl ad Panel
Block Assembly
High-Voltage : i"
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Supply Roller 2

Guide
Assembly

Paper
Pickup Block

Multipurpose
Tray Assembly

Figure 1 LaserWriter Pro 600/630 Exploded View

26 LaserWriter Pro 600/630

Main Printer Parts List

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LaserWriter Printers, Vol. 2 27

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Main engine SCrew Kit ..............ccccccccssseeccceeeeeesenseccceeeseessaseeeesensenseaes 076-0453
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Malt MOlOk Cable wicssd.citnscioteineinsineiexeredaasiaisedtevonaiasieawotnocwtbedosineeunes 922-0214
MUNITDUIDOSE Way 4 ctccicwsses hiaataieetnedantdaivitaaiebetinwnttteneieawnmdsliceein 922-0227
MultipurpOSe tray COVED ..........ccccccccseeccccssecceecseeeseceeeeeetecegeceeseeeeeneees 922-0221
Multipurpose tray Extension .............c.cceccceeceecececeeececeeeeeceeseeseseeeaeeees 922-0228
Multipurpose tray latch ............ccccccceecsceeeesceeeteseeeseeeesseeeseeeeeegeesanenes 922-0252
Paper pickup block
Cassette pickup roller .............ccccccccccsssssccceeeaeeesereereneeseecsesseneaneesss 922-0280
Cassette pickup SOI@NOI .................ccccccccceccecceseeneeeceececeeeeenaueaeeees 922-0275
Envelope feeder interface Cable ..0..........cccccccccsssseeceeccesseeeeeceeeneees 922-0285
CASA MOU I a setscctris naduce dysarecies vnairaaonancaewecuanbaverta Beatuaatetannat Gotten sarcece 922-0277
GUNG re descinaitalelsuedsass Satuaa eal sbnesnuase uta wanetanannaanaieaaeat iseniaaiaaet 922-0288
Multipurpose tray guide ASSEMDLy ................ cc ceecceeceeeceeeceeeseceesess 922-0286

LaserWriter Pro 600/630

PICKUP:SONSOF DOAN ssiceciscdesnceeadctacsinneetsiantaasearbantnavtaaiovxnenriuneds 922-0208

DENSON IEVEN viz, saci teennsoinet twa ssaeinvarsiqinneioisaasaccanannonnieecutadtewtidert: 922-0287
Multipurpose tray pickup roller...............c cc ceeeseseeeeceeeseeceneeeeseeeeeees 922-0281
Multipurpose tray Upper QUuICE ............. cece eeeeeeeeeneteeereeeeeeeeeeeneeees 922-0282
Multipurpose guide plate...............ccccccccccceneseeeeeeeeeeeeeeeeeeeeeeeeeeenens 922-0290
Multipurpose pickup SOICNOIC ...............ceeeeeeeeeeeeececeeeeeneeeeeeeeeeeeeees 922-0278
ODeNING GQUIKE erarcnntirGrctiermatcccnaiiet teres 922-0284
PADC QUIS arenes et cele ereeuds eke een acne oases 922-0283
Pickup: block frame (left) scious wwsntwcieacdthinesucini ent: 922-0276
Piekup block Gear Kita, n1a sei eerie ee en ae 076-0671
PICKUP: DIOCK MOON ‘a itssteces oi aadiin eurectee ait deesresetinee nascent 922-0207
Pickup block piece parts Kit ...............::ccccccesseceeeseseeeneneeeenaneeeeenaes 076-0674
Pickup block ring/spring kit ...............2::::::::sssseseeeeseeeeeeeeeeeeeeeeneesees 076-0672
Pickup block roller/shaft Kit ................cccccsssssssseeeceeeceeeeeeeeeeeeeeeeeeees 076-0673
Pickup Controller DOA .............ccccssseeecseseeeceeneeeeeaseeecesueeeenseeeeneaes 922-0206
Sensor holder ASSEMDIy .............ccccccessesseseeceeceeeeeeeeseeeceeeeeeeseeeenens 922-0289
PADS WEIGIG AY tiacahirernr era uetaeas oersewinvauteteneatederahekes cs atenad cena: 922-0270
PEDel WEIGME Bc ache rusas ee onnnsiawmeteckeawtcedneendstiacendh crsce cearet eerie arent t. 922-0271
Passive transter roller ccc ssnctscnseciccdrnahwas diene eta 922-0266
Pickup controller—DC controller Cable.............cccccceeceeseeceeeeeeeeeeeeeeees 922-0218
POWSMINIGL DANG laren cravetasinnmsuneneemntr dees aetna ern e 922-0224

EXDanSION'SIOUCAD sccsces iva ecmerahoneate eine vewve na vine etaat tk 922-0226
Power supply—DC controller Cable...............:ccccccssssseeeecuseesseeseneaaneees 922-0215
Power supply—HVPS interface PCB ...............ccccceeeceeeeeseseeeeeeeeeeeeeees 922-0204
Power supply—I/O controller Cable ..................cccccesseseeeeeneeeeeeeeeeaenees 922-0216
POWeEr SUDDIY. (11.07 11S) iecsiseted vecesdicotesien teste deca ctueiesvarcey Nance! 661-0802
Power Supply (220/240) ...........cccccccssssssececcceeseeeeceeseseeecesseeeeeceeseaeaees 661-0803
PaGal DanlOl sescestecsacenctasansnsuiene events sieeethig ptacosadcmnatsadtaeueasaantancueteete. 922-0225
Right Corner Panel .............ccceceesseeseeeeenseeseeeseesseseenseasseseessenseeseeeneonees 922-0223
Scanner—DC controller Cable ............ceceeceseceeceneeeessseeserereesseeeaeneeeees 922-0211
Secondary engine SCrew Kit... eeeeeneneeeeeeeneeeeeeeteeeeeeeeeeeees 076-0454
Sheet feeder connecting DIOCK .................cceceeceeeeeeeseeeeeeeeeeeeneeeeneeeees 922-0272
Sheet feeder interface Cable ........... cc ccececcececeeeereeneessseeeeeneesesseaaeeeeees 922-0219
SS UAP INC ecstatic ries eictianascae abies eai rel des ivnid Andatbp ona uenienteeatde: 922-0258
Toner Cartridge guide (left) ................ceceseeceseessessesereeeecenreeassseerenenees 922-0242
Toner Cartridge Quide (riQht) .............:cccceececeeeeseseeeeeeeeeceeeeananseeereesenes 922-0243
Toner Cartridge SUPPOMT ..............ccccccssssssesecescessereceseesserseetecssereeesseess 922-0244
Toner pressure arm (left) .............cccccccccsssececsesseeeeseeessesseeeesseeessageness 922-0250
Toner pressure arm (riQht) .............:ccccceceeseeeeeeseeensaeeeeeeaeereeseneesenaaeees 922-0251
LOD COVER ASSEMDIV iickacccte Gtitas ss lv ta Wop vicsanpviweeurndeouvebia le ieenieeas 922-0234

GOVERINTEHOCK BOM iicviiasdn cic cwcaeencuvsknatiou sa tixends tude otivevar medias 922-0236

OUIPUE TAY GXtCNSION ost iisccoteus dezexcand costed eevaeracatncetienwatenrad nantes cc 922-0237

Output tray extension NOIAEL.................ccccccescesssssseeeceeeteeeueeenseeeees 922-0238

LaserWriter Printers, Vol. 2 29

PADEr OULDUL- COVE? wisicsnuiccvcihiyseriacg Seacncsonn de aed venteaswarnteneauarmarenunes 922-0239
FOMCE ACCESS COVER siacssca decode eecei ose inladicars tee eaioin dears 922-0235
FOP GOVEE HINGES Kil sc. ete lovee ade he es on i nih vasutieh Sonrouas vamneee 076-0670
Transfer bDIOCK ASSEMDIy..............cccccssessseeccccessssecceseeesseeeeessueeseeeesseees 922-0267
Transfer QUuide ASSEMDIY ............cccccsssesseccecuseseseceesesaeeeeeeeeesaeeeeeentenas 922-0291
WNANSIOU ONO icsenmonnsealicanialen nice taste deminer adeno ae aemae) 922-0205
WINIVENSal CASSOMG sesesicossaeces values relaca beac iaeianeeoeeiiedtdewedeaeieeeveas 922-0383

LaserWriter Pro 600/630

Exploded View—Envelope Feeder

Printer
Interface

Cable ;
Right
Envelope
Weight Sou!
Drive Controller
Assembly pend
Motor Separation
Drive
Assembly
Front Cover
we Se Sensing Arm
Left Cover Sw
Bottom
Cover
Figure 2 LaserWriter Pro Envelope Feeder Exploded View
LaserWriter Printers, Vol. 2

Envelope Feeder Parts List

Note

The LaserWriter Pro envelope feeder is for use with the LaserWriter Pro 600
and 630 models only.

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BUSHING/TING/SPIIAG Kit s2cccscscesenscenccivetscasevsevaseancevaensesaseesveoesvervenaeeoess 076-0663
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RING ASSCIMIDIV tcctcssancccs co creanaahupinrecaunpiadneselesaate apse ea eine aewitobancives 922-0141
EPVEIODE WEIGUI cecsrencsewayinresessnereatiecteatacest meicneurse teieasneeauanthabadeteen 922-0127
Envelope WeIGNT ANN siscccccaccesdsovasseccdinssansttavcedecdssnenvssversanssevehbeoedenras 922-0128
FEE Poles; SECONGARY: cidesecacisteedeaauens ccvatsse edd seatnicdawd exdesdeaseendeniadeules 922-0134
F CCCEM TAINC: oj cnccandacsianca sxsetucncstads somsionse iad neta subeaateanineciet talent kes 922-0122
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RODE COV Ec arsat eet ecats Savers ioanaaneas tenane eauasenene tyne atetaneat as 922-0130
GOAl Kil ica sucacasueysacunayiaeceesannneraaee cea euls erase Se ea 076-0662
GUIde plate: Sotieicene ned oeeasie i ese Mae ee ae 922-0131
GUIDE Plate: Ground ise. svssiareers ceauhatcaie achat oda Rca arenaeneeheiadas 922-0132
Guide plate grounding Cable...............ccccccccceceeeerereeeeereeneeeneeeaeaaeeaeans 922-0133
LSM COVER uctitutieciienalk thea ahs eetarees ieee eee dae iar Ah Gels 922-0129
MOTO Sales dca tiede ie wealaes ish ede aa wdeheatata wet neneaakiacareant reba cemnaeiecnaantons 922-0121
Passive roller: Snatt sc. wiccitsawtweda iunti nant inewedarrvodentianhs ea uaeseoinn 922-0138
Pickup roller shaft, forward .............cccccccccseeeeceeeeeaaeeeeeeeeeaaeeeeeseeaaaenees 922-0146
PICKUP rOll6r- SHAM, TEAM ssicchiicctedtiveasme unausd eohivecdbavedsatinns Sxebndeedcead fetees 922-0145
PRESSUNC: DIOCK rennet cehuy ieee vole auet Peaueentetatiosnu tte veun chuawlaewerarcns Gensel: 922-0136
PrUMary TOCOSMaN uss caecayecbiay lotevavtewed va vencewsasiasuetadsshareeddelavbsapuetie ne 922-0147
Printer interface Cable ............ cc cccccccscsecceceseeeceaeeeeeseeneeessenseseneeseensees 922-0139
FRIGHT COVG let taetuan gee ee reee ccais conch euag pean buat ieaanugnte se Wenyedete easnacuer ese 922-0124
PROVO BIGWKIL cassis tisessd nas canecintiea uy suucnetauaesanarideuoareotinaaseuven aieriadaieutauweds 076-0664
DCO WW: KIC aati a esata lect wae ecbesaeaetu vans tnlia hall ncn dcaua et eaaecevunarecemas 076-0665
SENSING AM ic cenecnerveaded irene abv caaticsva tants Pedieacdeopausaveannny studea nee teles 922-0137
Separation ASSEMDIy ............ccccceeesceccccseeeeeeeeeeeeeeeeeeeseeaseeeeeeeaeeseeesens 922-0144
Separation ASSEMb|Y COUPIING..............cccccceeecesssseseeeceeceeeeseaueaeseeeeees 922-0135
Separation assembly Shaft ................cccccccccecccesessssseeeeeeeeeeeseeeeeseeeeees 922-0140
Separation drive assembly

Separation rive plate ...........ccceccccccecssseeceeeeseeeeeeeeseseeeseeeessseeesees 922-0143
SIZING CICS ys caseeaunientadchinyun tee etwneeguens weeneedacsannee asin hatinteteratsaes 922-0125
UPAY GXTGMSION wicrsstet on ice vneeinelacnccd ies deraytadle tek natl Shunt tavelovdandatabuverraniie 922-0126

LaserWriter Pro 600/630

Exploded View—Sheet Feeder

Drive Block
Pickup |
Roller |
p. | Controller

Board

Controller
Motor Assembly/ Block

Pickup Solenoid

Right Cover

Figure 3 LaserWriter Pro Sheet Feeder Exploded View

LaserWriter Printers, Vol. 2 33

Sheet Feeder Parts List

Note

The LaserWriter Pro sheet feeder is for use with the LaserWriter Pro 600 and
630 models only.

500 SNSCUCASSOTC 2ictu crac se calacrasoantvdsG ack emsaenerteatnmonsumnnontuaaien Meteaeases 922-0179
BASE DG es ieed tee oes ieesisiaate ceaseteen eiatntetaa techatapat cote seanenoatateareneuel 922-0159
BSC ND AIL TOOL carn oetaa sete teranis dee ctisuien Let a a eaeatusdeehd auewkanedpnonneites 922-0160
Bushing/spring/washet Kit ...........cccccececececcceeeeeeeeeeeeeeeeeeeeeeseeenanenenanens 076-0668
Cassette SIZ@ ACTUATOR ....... eee cccccesesesseeeceeeeesseeeecesaeasseeesensaeseeenees 922-0163
Cassette Size ACtUATOr COVER ..............ccceecccccccssesseeeceeeeeeeeeeesaesseeeees 922-0162
Controller DIOCK ai carervcucascicunanconnsaiy baccase usa aeaasvor ws sauen en uotuadenmortdaaves 922-0161
Controller DIOCK COVEF c.czescciesisssvsccuessinconssunnesveeaveeyetens beves doves eevaweden: 922-0155
COMMONER DOGG ei cc cies sto tatoeinicoe ope nea neeaeuectin eave erctarenneunatnee. 661-0798
DRIVE DIOCK 222. tacidoniearashencaweeneinasis sua pentane) osusaenunandaeueaeinn coudayeuiiennens 922-0483
DFiVe: DIOCK MOUNT ts ieicvseaccveavripeuinealvsvianisulannets aucthasees ceed tntas 922-0169
Drive DIOCK: DIAC eisai isvvedeccsupueseeicvaxs manmsetenn ee eiemmen haters 922-0168
FECCEr TONG wavickces sivicsauosnetinacvecriunneamianniecebae th acuvsianteweecesee tented: 922-0170
Feeder roller HOUSING i wevsaavsaensenscisanccvecsaaniwider ees tal eee 922-0165
FOGGEr SM Al ciujcarcerucoaecnaiicatecearza eins oie meet pntee dates amten epic enterteae 922-0172
GUIS ST AI icrosss teat nencanniatatutn auc easauteca us antert cade talle xtunitiavehsednsagaucbieniaas 922-0167
MOLOFr ASSSMIDIN 28 3 carasca avert aadencelanngpaubuerenacwdenia bh ues tuhenaeemeceerins 922-0149
PAPO WEIGMU isvandesacun ancieverawanaadutvatheevee mec reeaearuumasts Pate eons: 922-0177
Passive roller NOUSING vecisiiessicancuecieestaxenciasiausactenreviowsive ees wanareses 922-0166
Passive roller Moun seeuita cere tte an eee ieennnen 922-0175
PERCU soc eese ete tle at haar eaten on tospsenasia Ga tauaa lad aamier 922-0176
PICKUD: Cal icsieniotecedeiekecsate ete ae tetera caciaaies: 922-0171
PICK UD FONG ier states Seanenad lady ge ou tenet taies i ccxdsa when Masten bave: sep sinweteact wanten: 922-0178
PUCKUD SHAN s wicesidesie dean teas cceenilad ananlo net ctlnnvadboiaeveianeudsivdawedbyaalen 922-0173
FICK SOIG OIG accesses slut toe laces Tastee daceetboas aeneeinane tetiatar eens 922-0174
PROMI GII GT siccnten alah rousiadiicenteavieus Cade caoaneeesadeaauetaciuectaspantesacomoranennubietates 922-0157
Front: panel:SUupDOM (OG sic anai intact ohnaeieoarediawintatu adeatieaenendt 922-0158
AM oes sh gteet sant ciel sear toa cane eebatuenaia tte uavonan aetna de enacts 076-0666
HO SINEIG: DIACK EU iotinsienest ten senne staiidsiutacdacucrdecuba ten muenabherdadedadctntuncewenaens 922-0260
SPI ANG vices easusseacenstcitadsdcac va decade Suanenedeercteasaduucnnednsatieas rewranancntcnies: 922-0153
WOT DanC litcccsvessatrnaadonucsattd cadussatenas anes mec eaduaniacacecetie a eneamnes ees 922-0164
FRE Al Daniel ii cnnsrmaveurennncvaura wanna veuarmaene evehdemnianmaneieen se oeateeveaes 922-0151
Rear panel grounding plate .............. ee eeceeeeeecceeeeeeceeeeeeeeeeeeeneneeeenes 922-0156
PRIGIECOV GI fsck estates ees sede ase ee eae tan nes 922-0154
PRIMERA Carmien aici ioe asa ot decal chancuama renter aocer on ereua recta 922-0152
SC LOW IAG KI sala ile ri cactus tee atee demand kewbesnevtngaatnecternhdedeaiiterbaaetins 076-0667

LaserWriter Pro 600/630

Boards and RAM SIMM Configuration Guidelines

RAM SIMM Configuration Guidelines:
Socket 1 can hold a SIMM with one or two DRAM banks.
Socket 2 can hold a SIMM with one DRAM bank. Socket 2 may never contain a two-bank SIMM.
Socket 2 may be loaded with a single-bank SIMM only if socket 1 contains a single-bank SIMM.

Socket 2 Socket 1

Configuration
_

Switch Hi
(630 only)

SCSI
(630 only)

LocalTalk

RS-232 —_
Serial

Ethernet ——__|
(630 only)

Centronics VT)

UU UM LM LL

PDS Connector

Tn a

al
yo

ROM SIMM
(may not be present
on all boards)

Figure 4 LaserWriter Pro 600 and 630 I/O Board

\ fy J206

J207 J208
J202 U
J213 §

J201 i ll s209[ |
C2010 0 C202

J211 5210
J212 TB201
CJ

—

a a

Figure 5 LaserWriter Pro 600 and 630 DC Controller Board

LaserWriter Printers, Vol. 2 35

Specifications

Print Engine Specifications

Marking
Engine

Printing
Method

Canon LBP engine

Electrophotography using single-component microfine toner

Optical
System

Print
Resolution

Print
Capacities
and Materials

Semiconductor laser and a rotating six-faced prism scanning
mirror

600 dpi* (300 dpi when PhotoGrade is enabled)
*The LaserWriter Pro 600 and 630 require 8 MB of RAM in order
to print in PhotoGrade or to print at 600 dpi.

Standard Cassette (250 sheets):
A4, B5, legal, letter, or executive plain paper (16—24 Ib.)
Cassettes available: letter, A4, or universal

Multipurpose Tray (100 sheets)
Plain paper from 7.16 in. by 10.1 in. to 8.5 in. by 14 in.
(16-32 Ib.), envelopes, and fuser-compatible labels and film

Lower Cassette (500 sheets)
A4, B5, legal, letter, or executive plain paper (16—24 Ib.)
Cassette available: universal

Envelope Feeder (75 envelopes)
COM-10, DC, Monarch, C5, B5 (recommended envelope);
from 3.54 in. by 7.44 in. to 7.0 in. by 10.0 in. (Do not use
envelopes with clasps, snaps, windows, or synthetic
materials. Envelopes with peel-off adhesive strips or double
sealable flaps must use fuser-compatible adhesive.)

Speed

8 pages per minute (letter or A4)
6 envelopes per minute (optional envelope feeder)

Dimensions

Height: 11.61 in. (295 mm)
Width: 16.69 in. (424 mm)
Depth: 16.37 in. (416 mm)
Weight: 40.7 Ib. (18.5 kg)

Operating
Requirements

50—90.5° F (10-32.5° C)
20-80% relative humidity

Power
Requirements

U.S./Japan: 100—115 VAC, 50-60 Hz
Europe/Australia: 220-240 VAC, 50 Hz

Macintosh
Requirement

System Software 6.0.5 or later

External Hard
Drives

LaserWriter Pro 630 only—
Up to 7 drives

LaserWriter Pro 600/630

V/O Board Specifications

Pinouts

8 MB, expandable to 32 MB
2 MB standard

40-pin processor direct slot (PDS)

LocalTalk, RS-232, Centronics, SCSI (630 only),
Ethernet (630 only)

Settings Use configuration switch or the LaserWriter Utility to set
communication protocols. The setting of the
configuration switch affects the configuration of all
the pinouts. See the user's guide for switch

settings.

Imaging Languages
Supported

QuickDraw, PostScript Level 2, and HP PCL 4

LaserWriter Printers, Vol. 2 37

Printer Diagnostic

Note

DE-9 Serial Connector

The LaserWriter Pro has self-diagnostic capability built into the I/O board.
When the printer is in diagnostic mode, the LEDs are displayed in special
diagnostic sequences.

In diagnostic mode, the normal functioning of the LEDs is suspended. The
LED configuration has no correlation with Ready, Low-Toner, Paper Out, or
Paper Jam status.

———

Figure 6 DE-9 Serial Connector
To put the LaserWriter Pro into diagnostic mode, follow these steps:

1. Switch off the printer.

2. Install a cassette tray and toner cartridge.

3. Jumper pins 7 and 9 on the I/O board DE-9 connector, as shown in
Figure 6.

4. Switch on the printer.

At this point, the LEDs should flash during startup for about 15 seconds and
then fix on the "diagnostic executing" (see Figure 7) configuration for about

two minutes.

If the "diagnostic executing" LEDs persist longer than two or three minutes, an
unknown error exists.

If no error is found, all LEDs come on and two pages print. See Figure 7 to
interpret the diagnostic LEDs.

LaserWriter Pro 600/630

Diagnostic Executing

No Error Found

FUSER ASSEMBLY
Go to Table 6

LASER/SCANNER
Go to Table 7

MAIN MOTOR
Go to Table 8

FAN MOTOR
Go to Table 9

/O BOARD
Go to Table 10

ROM 1
Go to Table 10

ROM 2
Go to Table 10

ROM 3
Go to Table 10

ROM 4
Go to Table 10

SIMM 1
Go to Table 10

SIMM 2
Go to Table 10

Figure 7 Diagnostic LEDs

If the diagnostic LEDs indicate a fault, go to the appropriate troubleshooting
table under "Troubleshooting the LaserWriter Pro 600/630."

ACaution Remember to remove the jumper after reading the LED
configuration.

LaserWriter Printers, Vol. 2 39

Test and Configuration Pages

Note

An operational LaserWriter Pro can print three special pages. Each page
indicates information that can isolate problems and/or identify the
configuration of the printer. These three pages are

e — Startup test page

e Service test page

¢ Configuration page

The printer generates a startup test page two to three minutes after you switch
on the printer. Successful printing of this page indicates that the I/O board is

operational.

The startup test page may not print due to software disabling. Use the
LaserWriter Utility to enable the startup test page.

Service Test
Page Button

ari
q

lai
==

\_ |
i

Figure 8 Service Test Page Button

The printer generates a service test page when you press the service test page
button. (See Figure 8.) To access the service test page button, open the
multipurpose tray. The button is located in the upper right corner of the
opening. The button is small and difficult to see against the black plastic. Use
a paper clip or similar tool to press the button. Successful printing of this page
indicates that the printer engine is operational.

LaserWriter Pro 600/630

The printer generates a configuration page when you issue the "Print
Configuration Page" command with the LaserWriter Utility.

The configuration page provides the following valuable information:

¢ Network address settings

¢ Amount and allocation of RAM memory and readout of EEROM integrity
¢ Switch configurations

e HP LaserJet emulator version

¢ Startup page setting (on or off)

e — LaserWriter serial number

¢ Timeout settings

¢ — System administrator password

e SCSIID (LaserWriter Pro 630 only)
¢ — Halftone screen settings

¢ Default margin offsets

If possible, always print a configuration page before calling Apple Technical
Assistance Center.

LaserWriter Printers, Vol. 2 41

Troubleshooting the LaserWriter Pro 600/630

Before you begin troubleshooting, check the printer setup and operating
conditions described in the following section, Pre-Power-On Checklist. If the
problem persists, refer to the flowchart later in this troubleshooting section.

The flowchart directs you to perform various tasks and refer you to specific
troubleshooting tables. Perform each step in the troubleshooting tables in
order, and refer as necessary to the wiring diagram that follows the tables.

Retry the printer each time you change its physical state—such as when you
replace a component—until the problem is resolved. If you replace a module
and find that the problem remains, reinstall the original module before
proceeding.

When the printer is repaired, perform the necessary preventive maintenance
before returning it to the customer. Make sure you are familiar with all
procedures described in the "Safety" section in the front of this guide before
performing any live electrical checks.

Pre-Power-On Checklist

Check the following items before proceeding with the troubleshooting
flowchart or tables:

¢ — Line voltage is OK (U.S.: 115 VAC + 10%; Int'l: 220 VAC + 10%).

e — Printer is installed on a solid, level surface.

¢ Room temperature is 50-90° F (10—32.5° C).

¢ Humidity is 20-80%.

e — Printer is not located in a hot or humid area, near open flames, or in
a dusty location.

¢ — Printer is not exposed to ammonia gas.

e Printer is not in direct sunlight.

¢ — Printer is installed in a well-ventilated area.

¢ — Cables and connectors are OK.

¢ — Toner cartridge is installed and has toner.

e — Paper cassette is properly loaded with paper.

e — Paper is within specifications.

¢ — Top cover and fuser door are closed.

¢ — Fuser roller levers are in a down position.

LaserWriter Pro 600/630

Note

Troubleshooting Tips

This section contains important information regarding the LaserWriter
Pro. Read through this section before troubleshooting the printer. The
procedures in this section are referenced from the troubleshooting
tables.

Multimeter Probes

The connectors within the LaserWriter Pro are very small and require
sharp needle-point probes to make good contact. Do not use probes
that do not make proper contact.

To see whether a set of probes works properly, test resistance at
connector J210 on the DC controller board in the following manner (the
cable must be connected to the board):

Set your multimeter to resistance and insert the probes at pins 1 and 10.
If the reading indicates continuity, then the probes are making good
contact. If the reading indicates infinite resistance, then the probes do
not make contact and should not be used with the LaserWriter Pro.

Forcing a Feed Cycle

If you want to print from anything other than the standard 250-sheet
cassette tray, you must be connected to a CPU and select the feed option
that you want (see Maintaining I/O Connectivity later in this section). It is
not possible to print a service test page from any source other than the
standard cassette.

Interrupting a Print Cycle

Interrupting a print cycle and inspecting the photosensitive drum can
help isolate the cause of print quality problems. To inspect the drum, run
a print and wait until the paper clears the synchronization pause at the
registration paper sensor. Open the toner access door, remove the toner
cartridge, and pull back the shield to inspect the drum.

If the image on the surface of the drum exhibits the same problem as the
printed page, the fault exists at some point before the drum, probably
somewhere in the imaging system.

If the image on the drum is OK, the fault exists at some point after the
drum, probably in the fuser assembly, transfer block, or high-voltage
power supply.

LaserWriter Printers, Vol. 2 43

Maintaining I/O Connectivity

When you remove the I/O shield, you disrupt the connection between the I/O
board and the DC controller board, thus preventing the printer engine from
communicating with an external computer. When it is necessary to maintain
this connection during troubleshooting (for example, to force a feed cycle
from the multipurpose tray or to change settings with the LaserWriter Utility),
you must remove the printer interface cable and temporarily install a Quadra
900/950 floppy drive 20-pin cable between connectors A and B, as shown in
Figure 9. This cable has the extra length needed for the I/O shield to rest flat
on the work surface. Do not disconnect power supply cable J15, the I/O-CPU
cabling, or the AC power cable.

DC Controller
Board

Cassette Pickup A Quadra 900/950 B /O Board
Tray Block Floppy Drive
| 20-Pin Cable
|
Pickup Connectivity I/O Connectivity

Figure 9 Maintaining Connectivity

44 LaserWriter Pro 600/630

ACaution

Maintaining Pickup Connectivity

The following procedure enables you to take voltage readings from the paper
pickup block. Refer to the LaserWriter Pro wiring diagram for an illustration
showing the connector layout of the solder-side of the pickup controller

board.

1. Disable the startup test page using the LaserWriter Utility.

2. Remove the pickup block.

3. Reconnect cables J601 and J603 (C in Figure 9).

4. Load paper into the cassette tray and install the cassette tray into the
pickup block.

5. Press down the top cover interlock actuator and force the interlock
switch closed by wedging in the hooked end of the green cleaning brush
(D in Figure 9).

6. Reinstall the top cover and cover liner and close the lid.

7. — Install the envelope feeder or sheet feeder if you need to test feed from

those sources.

Do not let the pickup controller board brush up against the metal
chassis while you are performing this procedure.

Drum Exposure

Make sure you cover the toner cartridge during servicing. Prolonged exposure
to light can result in print quality problems. If damage has occurred, store the
toner cartridge in a dark place. The drum returns to its normal condition after
about 24 hours.

LaserWriter Printers, Vol. 2 45

Setting Fuser Rollers

Two small levers at each end of the fuser set the fuser rollers into either a
down position (print mode) or an up position (jam-release mode). Apple
ships the printer with the rollers in an up position to protect rollers against
deformation. The two levers must be set in a down position for proper fusing
to take place (see Figure 10). If you are experiencing fusing problems of any
kind, first confirm that these levers are in a down position.

ee,

i :
FT TMU

ST :

eI IIE
a 8,

oy Sy
RSS BD

Figure 10 Setting Fuser Rollers

46 LaserWriter Pro 600/630

Sensing System

PS601 Cassette
Paper Sensor

Sensor Holder

Assembly
Delivery/
Interlock
Sensor

PS602 ~ PS701
Registration Multipurpose
Paper Sensor Paper-End

Sensor

PS702
Multipurpose
Paper-Present
Sensor

Paper Pickup Block

Figure 11 Sensing System

The LaserWriter Pro has four paper sensors and one dual-action sensor (see
Figure 11).

e Cassette paper sensor PS601 senses presence of paper in the cassette.

e Registration paper sensor PS602 senses the arrival of paper at the
photosensitive drum.

¢ Multipurpose paper-end sensor PS701 senses the length of paper that
feeds from the multipurpose tray.

¢ Multipurpose paper-present sensor PS702 senses the presence of paper
in the multipurpose tray.

¢ — Delivery/interlock sensor PS201 senses closure of the fuser access door
and the exiting of paper from the fuser assembly.

Note The sheet feeder has a paper-present sensor PS851, and the envelope feeder
has a paper-present sensor PS931.

LaserWriter Printers, Vol. 2 47

LaserWriter Pro 600/630 Troubleshooting Flowchart

START

Connect the printer to a
known-good computer,
install a toner cartridge,
and fill the cassette tray.

Does the
fan come on when
you switch on the
printer?

Go to Table 1.

the ready LED No

glow steadily after the (a)
printer warms

up?

Try printing from each
available paper source. If
the printer does not pick up
paper, or if the paper jams,
go to Figure 13.

Is the print Go to Figure 12,

Print Quality
quality OK? Problems.

If necessary, restore the
customer's LaserWriter
Utility settings. (For
example: Startup Page,
Automatic Tray Switching,
and Default Resolution).

PRINTER IS FUNCTIONAL

LaserWriter Pro 600/630 Print Engine Check (1 of 2)

LaserWriter Pro 600/630

Are all
LEDs off?

Yes
Go to Table 2.

Are
the Paper-Out
and Paper-Jam LEDs
flashing?

Perform the

wes procedure in the

"Printer Diagnostic"
section.

Is the Toner Yes

LED on? Go to Table 3.

Is the Paper-Out “ee

LED on? Go to Table 4.

Is the Paper-Jam Yes

LED on? Go to Table 5.

If the ready LED flashes without
stopping, disconnect the printer from
the computer, and see if the problem

persists. If you have just performed
the printer diagnostic (see the
"Printer Diagnostic" section),
confirm that the jumper has been
removed from the DE-9 connector.

LaserWriter Pro 600/630 Print Engine Check (2 of 2)

LaserWriter Printers, Vol. 2 49

Troubleshooting Tables

Important As you proceed through the steps in a table, remember to retry the
printer each time you change its physical state—such as when you
replace a module. If the problem remains, reinstall the original
module before proceeding to the next step in the table. Refer as
necessary to the wiring diagram that follows the tables.

Table 1 Fan Does Not Come On When You Start Up the Printer

Remove the rear panel and I/O Secure the cable.
shield. Is the DC controller board

cable securely connected to J103 on

the power supply?

Is the fan cable securely connected to Secure the cable.
J209 on the DC controller board?

Do any of the motors rotate after the Replace the fan. If the
printer starts up? problem persists, replace
the DC controller board.

Replace the power supply.
If the problem persists,
replace the DC controller
board.

Table 2 All LEDs Are Off After Printer Warmup (1 of 2)

Are the top cover and fuser door :

closed?
50 LaserWriter Pro 600/630

Action

Close them completely. In
normal operation, no LEDs
illuminate if either door is
open.

Is the plastic tab actuator on the fuser Replace the fuser door.

door intact?

Is the cover interlock arm on the top
cover intact?

Replace the cover
interlock arm.

Secure the cable.

Remove the rear panel and I/O
shield. Is the status panel cable
securely connected to J204 on the
DC controller board?

Table 2 All LEDs Are Off After Printer Warmup (2 of 2)

Can you print despite the fact that no
LEDs illuminate?

Place probes between J208-2 (GND)
and J208-3 (PSNS). Does the
voltage rise to 5V as you open the
fuser door?

Place probes between J201-1 (GND)
and J201-7 (+5 V). Does the voltage
measure 5 V?

Press the top cover interlock leaf
spring. Do you hear the clicking
sound of a microswitch when you
press the spring?

Remove the top cover and delivery
roller assembly. Is the purple cable
between the delivery/interlock sensor
and the DC controller board securely
connected?

Remove the paper pickup block and
maintain pickup connectivity. Place
probes between J601-11 (GND) and
J601-7 (+5V) on the solder-side of
the pickup controller board. Does
voltage measure 5 V?

Pde
Yes
No

LaserWriter Printers, Vol. 2

Check connections
between the status panel
and the DC controller
board. If the connections
are secure, replace the
status panel.

Replace the
delivery/interlock
assembly.

Replace the DC controller
board.

If you have just
reassembled the printer
after servicing the pickup
block, make sure you have
installed the black plastic
actuator behind the pickup
controller board.

Secure the cable.

Replace the pickup
controller board.

Replace the DC controller
board-to-pickup controller
board cable.

Step Check

Table 3 Toner LED Is On After Printer Warmup

Result

Action

inspect all the toner contacts for
damage or excess toner buildup. Are
all the contacts clean and in good
condition?

Try a known-good toner cartridge. No Problem solved.
Does the problem persist? |
2 Have you recently serviced the printer Yes You probably did not fully
and has this symptom existed ever reseat the high-voltage
since? power supply, high-voltage
connecting block, or
transfer block assembly.
Make sure these modules
are securely installed.
3 Remove the toner cartridge and No Clean or repair the

contacts if possible.
Otherwise, replace the
transfer block assembly.

Remove the rear panel and I/O
shield. Place probes between J210-6
(HVRST) and J210-10 (GND) and
switch on the printer. Does the
voltage change from 0 to 5 V about
one second after the printer starts
up?

Yes

Replace the DC controller
board.

Perform the first module
exchange below. If the
problem persists, reinstall
the original module and
perform the next
exchange:

¢ Replace the high-voltage
power supply.

e Replace the power
supply-to-HVPS
interface board.

e Replace the transfer
block assembly.

¢ Replace the DC
controller board-to-

HVPS cable.

LaserWriter Pro 600/630

Table 4 Paper-Out LED Is On After Printer Warmup

Check Result Action

Are the actuator tabs on the cassette No | Replace the cassette.
intact?

Remove the cassette. Is the cassette Yes Replace the sensor holder

paper sensing lever broken? assembly.

fis

Defeat the cassette paper sensing Yes | Replace the pickup
lever by pushing it and holding it in controller board.
(as if a cassette were present). With
your other hand, press the three
microswitch leaf springs all at the
same time. Does the Ready LED
illuminate after a couple of seconds?

Remove the rear panel and I/O No Replace the DC controller
shield. Place probes between J201-7 board.

(+5 V) and J201-1 (GND) on the DC

controller board. Switch on the

printer. Does the voltage measure

5 V?

Remove the paper pickup block and Replace the DC controller
maintain pickup connectivity. Place board-to-pickup controller
probes between J601-11 (GND) and board cable.

J601-7 (+5 V) on the solder-side of

the pickup controller board. Does

voltage measure 5 V?

Place probes between J605-3 (1STS) Replace the pickup
and J605-5 (GND). Does the voltage controller board.
measure 5 V?

Keep the probes in the same position Replace the sensor holder

and manually trip the cassette paper assembly.

sensing lever. Does the voltage drop

to 0 V when you trip the lever? Replace the DC controller
board.

LaserWriter Printers, Vol. 2 53

Check

Result

Table 5 Jam LED Is On After Printer Warmup (1 of 2)

Action

| Is the delivery/interlock sensor
snagged?

Yes

Remove the top cover and
delivery roller assembly,
and unsnag the sensor

spring.

Is the delivery-sensing lever
snagged?

(Open the spring-loaded separation
guide on the fuser assembly and flick
the end of the sensing lever
immediately outside the fuser rollers.
The lever should move freely.)

| Remove the top cover and

delivery roller assembly
and see what is snagging
the lever. If necessary,
remove and dismantle the
fuser assembly and
replace the delivery-
sensing lever.

Is the registration-sensing lever
snagged?

(Remove the toner cartridge and flick
the exposed tip of the registration
paper sensing lever.)

Remove the rear panel, I/O shield,
top cover, and delivery roller
assembly. Is the purple cable
between the delivery/interlock sensor
and the DC controller board securely
connected?

If the lever is broken or
snagged, remove the
pickup block and
troubleshoot further. If
necessary, replace the
sensor holder assembly.

Secure the cable.

Place probes between J208-2 (GND)
and J208-3 (PSNS). Does the
voltage rise to 5 V as you open the
fuser door?

Replace the
delivery/interlock
assembly.

Place probes between J201-7 (+5V)
and J201-1 (GND) on the DC
controller board. Does the voltage
measure 5 V?

Replace the DC controller
board.

LaserWriter Pro 600/630

Table 5 Jam LED Is On After Printer Warmup (2 of 2)

Remove the paper pickup block and Replace the DC controller
maintain pickup connectivity. Place board-to-pickup controller
probes between J601-7 (+5V) and board cable.
J601-11 (GND) on the solder-side of

the pickup controller board. Does the
voltage measure 5 V?

Place probes between J605-6
(RESS) and J605-5 (GND). Does the
voltage measure 5 V?

Replace the pickup
controller board.

Keep the probes in the same position Replace the sensor holder
and manually trip the registration assembly.

sensor lever. Does the voltage drop
to 0 V when you trip the lever? Replace the DC controller
board.

Important When there is a failure of the fusing system, the DC controller board
shuts off current to the fuser roller heater and charges capacitor
C202 on the DC controller board to prevent overheating. If there is a
failure of the fusing system, you must turn off the power for about 10
minutes, or manually discharge the capacitor before switching power
back on.

Table 6 Fuser Assembly Error (1 of 2)

1 Remove the rear panel and I/O Secure the cable.
shield. Is the fuser assembly cable
securely connected to J210 on the
DC controller board?

Is the power supply firmly seated? No Seat the power supply.

Remove the fuser assembly and let it Disconnect J744 and

cool to room temperature. Measure check for same resistance.
LaserWriter Printers, Vol. 2 55

the resistance between J743-6 and Replace the thermistor or
J743-7 on the fuser assembly. (Refer the connector cable, as
to the wiring diagram for illustration needed.
and pin layout of connector J743.)
Does the resistance measure
between 180 and 280 kQ?

Check

Table 6 Fuser Assembly Error (2 of 2)

Action

Measure the resistance between
J743-1 and J743-8 on the fuser
assembly. Does the resistance
measure approximately 3 Q or less?

If there is continuity
through the heater bulb,
replace the heater bulb. If
there is continuity across
the thermoprotector,
replace the fuser
connector cable. If there
is not continuity across the
thermoprotector replace
the thermoprotector, and
proceed to the next step.

Reinstall the fuser assembly. Place
probes between J212-1 (/FSRD) and
TB201-6 (GND) on the DC controller
board. Does the voltage change from
approximately 5.1 V to 1.5 V a few
seconds after the printer starts up?

Replace the DC controller
board.

Place probes between J212-2 (RLD)
and TB201-6 (GND). Does the
voltage measure approximately

2.1 V?

Replace the DC controller
board.

Replace the power supply.

LaserWriter Pro 600/630

Table 7 Laser/Scanner Error

Result Action

Remove the rear panel and I/O Secure the cables.
shield. Are the laser/scanner cables

securely connected at J205 and J206

on the DC controller board?

Remove the top cover and delivery Secure the cables.
roller assembly. Are all three cables

going into the laser/scanner assembly

secure?

Remove the two cables that run from Replace the defective

the DC controller board to the cable.

laser/scanner assembly and check

the resistance through each wire. Is Perform the first module

the resistance through each wire exchange below. If the

approximately 1 ohm or less? problem persists, reinstall
the original module and
perform the next
exchange:
e Replace the

laser/scanner assembly.

e Replace the DC
controller board.

Table 8 Main Motor Error

Remove the rear panel and I/O Secure the cable.
shield. Is the main motor cable
secure at J211 on the DC controller Perform the first module
board and at J131 on the main exchange listed below. If
motor? the problem persists,
reinstall the original
module and perform the
next exchange:
e Replace the main motor.
e Replace the DC
controller board.
e Replace the main motor
cable.

LaserWriter Printers, Vol. 2 57

Table 9 Fan Error

Check

Action

Remove the rear panel and I/O
shield. Is the fan cable secure at
J209 on the DC controller board?

Secure the cable.

Place probes at J209-1 (FAND) and
J209-3 (GND). Does the voltage

change from approximately 24.5 to 16
V a few seconds after the printer
starts up?

Place the probes at J209-2 (FLOCK)
and J209-3 (GND) on the DC
controller board. Does the voltage
measure 2.2 V or more?

NS. ON ft you receive an I/O board error?

Did you receive a SIMM error?

Table 10 I/O Board or a nee Errors

Did you receive a ROM error?

+ Yes

Replace the DC controller
board.

Replace the fan.

Replace the DC controller
board.

ae... el the I/O board.

Replace the SIMM. Make
sure you adhere to the
SIMM configuration
guidelines indicated in
Figure 4.

Replace the I/O board.

_aserWriter Pro 600/630

All-Blank Page All-Black Page Light/Faded Image
See Table 11 See Table 12 See Table 13

Black Vertical White Vertical Black Horizontal

Line(s) Line(s) Lines
See Table 15 See Table 16 See Table 17

Vertical Distortion Bad Fusing
See Table 20 See Table 21

Toner on Back Grayscale/ Repetitive Defects

See Table 23 Resolution See Table 25
See Table 24

Figure 12 Print Quality Problems

LaserWriter Printers, Vol. 2

Dark Image
See Table 14

Bad Registration
See Table 18

Blank Spots
See Table 22

White Horizontal
Stripes
See Table 7

Table 11 All-Blank Page

Check Result Action

Is the sealing tape removed from the
toner cartridge?

Remove the sealing tape.

Have you recently installed a
laser/scanner unit and has this
symptom existed ever since?

The laser shutter may
have been installed
incorrectly. The shutter
should spring back and
forth as you insert the
toner cartridge.

Does this symptom occur only with
envelopes?

Instruct the customer to
adjust margins in the
document.

Run the printer diagnostic test (see
"Printer Diagnostic"). Does the test
indicate a specific error?

| Go to the appropriate

table, as indicated in
Figure 7.

Remove the rear panel and I/O
shield. Place probes between J210-6

(HVRST) and J210-10 (GND). Does
the voltage change from 0 to 5 V
about one second after the printer
starts up?

Replace the DC controller
board.

Place probes between J210-9 (SLO2)
and J210-10 (GND). Does the
voltage measure approximately 0.7 V
about one second after the main
motor starts?

Replace the DC controller
board.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

e Replace the high-voltage
power supply.

¢ Replace the power
supply-to-HVPS
interface board.

e Replace the transfer
block assembly.

LaserWriter Pro 600/630

Table 12 All-Black Page

Action

Run the printer diagnostic test (see Go to the appropriate
"Printer Diagnostic"). Does the test table, as indicated in
indicate a specific error? Figure 7.

Place probes between J210-9 (SLO2) Replace the DC controller
and J210-10 (GND). Does the board.
voltage measure approximately 0.7 V
about one second after the main Perform the first module
motor starts? exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
e Replace the high-voltage
power supply.
e Replace the power
supply-to-HVPS
interface board.

LaserWriter Printers, Vol. 2 61

Step

Table 13 Uniformly Light/Faded Image Over Entire Page

Check

Result

Adjust the density using the
LaserWriter Utility. Does the problem
persist?

Action

Problem solved.

Try printing with known-good toner
cartridge. Does the problem persist?

Problem solved.

Run the printer diagnostic test (see
"Printer Diagnostic"). Does the test
indicate a specific error?

Go to the appropriate
table, as indicated in
Figure 7.

| Replace the transfer roller with a

known-good transfer roller. Does the
problem persist?

Problem solved.

Have you recently serviced the printer
and has this symptom existed ever
since?

Remove the rear panel and |/O
shield. Place probes between J210-9
(SLO2) and J210-10 (GND). Does
the voltage read about 0.7 V about
one second after the main motor
starts?

You probably did not fully
reseat the high-voltage
power supply, high-voltage
connecting block, or
transfer roller block
assembly. Make sure
these modules are
securely installed.

Replace the DC controller
board.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:

e Replace the
high-voltage power
supply.

¢ Replace the power
supply-to-HVPS
interface board.

LaserWriter Pro 600/630

Table 14 Uniformly Dark Image Over Entire Page

Adjust the density using the
LaserWriter Utility. Does the problem
persist?

Run the printer diagnostic test (see
"Printer Diagnostic"). Does the test
indicate a specific error?

Clean the printer drum grounding
contact and cartridge contact and
print a test page. Does the problem
persist?

Remove the rear panel and I/O
shield. Place probes between J210-6
(HVRST) and J210-10 (GND). Does
the voltage change from 0 to 5 V
about one second after the printer
starts up?

LaserWriter Printers, Vol. 2

Result

Action

Problem solved.

Go to the appropriate
table, as indicated by
Figure 7.

Problem solved.

Replace the DC controller
board.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:

e Replace the
high-voltage power
supply.

e Replace the power
supply-to-HVPS
interface board.

Table 17 Black Horizontal Lines, Sharp and Well-Defined

Result Action

Try a known-good toner cartridge. Problem solved.
Does the problem persist?

Does the symptom occur on a service Replace the I/O board.
test page?
Go to Table 7,

Laser/Scanner Error.

Table 18 Bad Registration
Check / Result | Action

Try printing with known-good paper. Problem solved.
Does the problem persist?

Try printing with less paper at the Problem solved.
paper source. Does the problem
persist?

Run a print from a different paper Replace or reinstall the

source. Does the problem persist? faulty pickup roller at the
source from which the
problem occurs.

Remove the rear panel and I/O shield Problem solved.
and locate varistor VR202 on the DC
controller board. Perform the Replace the sensor holder
registration adjustment procedure assembly.

(refer to Service Source for a full
description of this procedure). Does
the problem persist?

LaserWriter Printers, Vol. 2 65

Table 19 Stairstepping/Vertical Lines Jagged or Shaky

Check

Result

Action

Run a service test page. Does the
problem persist?

Run the printer diagnostic test (see
“Printer Diagnostic"). Does the test
indicate a specific error?

Replace the I/O board.

| Go to the appropriate

Table, as indicated in
Figure 7.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
¢ Replace the
laser/scanner assembly.
e Replace the DC
controller board.

Table 20 Vertical Elongation or Foreshortening

| Step | Check

Result

Action

Run the printer diagnostic test (see
"Printer Diagnostic"). Does the test
indicate a specific error?

Yes

Go to the appropriate
table, as indicated in
Figure 7.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

¢ Replace the main motor.

e Replace the DC
controller board.

e Replace the
laser/scanner assembly.

LaserWriter Pro 600/630

Table 21 Bad Fusing

Are the fuser roller levers in a down No Engage the fuser rollers
position? (See Setting Fuser Rollers by setting the two levers in
under "Troubleshooting the a down position.

LaserWriter Pro 600/630.")
Go to Table 6, Fuser
Assembly Error.

Table 22 Blank Spots/Random Pattern or Location

Try printing with known-good paper.
Does the problem persist?

Are the humidity conditions within Inform the customer of the
specification? changes that are
necessary.

Are you printing on the correct side of Turn over the paper.
the paper? (Examine the packaging

label to see if the manufacturer Go to Table 21, Bad
specifies a print side.) Fusing.

Is the toner smudge in a small area noel Sa or replace the

behind the upper-left corner of the pickup roller.

page?
Clean or replace the
transfer roller, transfer
guide assembly, or lower
fuser roller with a dry, lint-
free cloth.

LaserWriter Printers, Vol. 2 67

Table 24 Cannot Print in PhotoGrade/600 dpi

Check Result Action

Are you trying to print in PhotoGrade Yes The Photograde option is
at 600 dpi? only available if you set
resolution to 300 dpi.

Restart the printer and inspect the You cannot print in
startup page (or use the LaserWriter PhotoGrade or 600 dpi
Utility to run a configuration page). Is with less than 8 MB of
there at least 8 MB of RAM installed? RAM. If there is one
single-sided SIMM
installed, someone has
downgraded the printer (all
LaserWriter Pro printers
ship with 8 MB of RAM). If
there are two SIMMs
installed, run the printer
diagnostic (see "Printer
Diagnostic") to see if one
is bad.

Reset default imaging
options for the printer with
the LaserWriter Utility.

68 LaserWriter Pro 600/630

8
Table 25 Repetitive Defects

Step Check Result Action

1 Try a known-good toner cartridge. No Problem solved.
Does the problem persist?

Does the symptom occur on a service Replace the I/O board.
test page?

3 is the repetitive staining along the left | Clean the feeder rollers
edge of the paper? with a dry lint-free cloth.

Interrupt a print cycle (see Interrupting Clean or replace the

a Print Cycle under "Troubleshooting pickup/transfer rollers and
the LaserWriter Pro 600/630"). Is the guides as required.
symptom present on the drum?

Table 26 Printer Picking Up From Wrong Source

1 Is the selected paper source empty?

Select paper handling in
the LaserWriter Utility and
turn off automatic tray
switching if you do not
want paper to feed from a
secondary source when
the selected source is
empty.

There is a problem with
the sensing system. Make
sure that automatic tray
switching is off and try
printing again. If there are
jam or pickup problems at
that point, refer to Figure
13.

LaserWriter Printers, Vol. 2 69

Make sure that the top cover and fuser door are shut, and that a cassette and
toner cartridge are installed. Go to the table indicated in Figure 13.

Leading Edge of Jammed Paper Is
in Fuser/Delivery Area

Go te Table 31 Printer Is Picking Up

From Wrong Source
Go to Table 26

No Pickup From
Envelope Feeder
Go to Table 27

No Pickup From
Multipurpose Tray
Go to Table 28

No Pickup From
Standard Cassette
Go to Table 29

Leading Edge of

Jammed Paper Is

in Pickup/
Transfer Area
Go to Table 32

No Pickup From
Lower Cassette
Go to Table 30

Figure 13 Paper Transport Problems

LaserWriter Pro 600/630

Table 27 No Pickup From Envelope Feeder
Aation

1 Is paper picking up correctly from the Go to Table 29.
standard cassette?

Remove the left, right, and bottom Perform the first module

covers of the envelope feeder and exchange below. If the

install the feeder into the printer. problem persists, reinstall

Restart the printer. Do the envelope the original module and

feeder motor and gearing engage perform the next

after you restart? exchange:

¢ Replace the pickup
controller board.

¢ Replace the envelope
feeder controller board.

¢ Replace the printer
interface cable in the
envelope feeder.

¢ Replace the printer

interface cable in the

pickup block.

Yes

Remove the paper pickup block from
the printer and maintain pickup
connectivity. You will be taking
measurements from the solder-side of
the pickup controller board.

Replace the pickup
controller board.

Place probes between J604-4 (GND)
and J604-1 (+24 V). Does the
voltage measure 24 V?

Place probes between J136-1
(+24 VA) and J136-4 (GND) on the
receptacle that the envelope feeder
plugs into (refer to the wiring diagram
for illustration and pin layout of
connector J136). Does the voltage
measure 24 V?

Replace the envelope
feeder interface cable.

Perform the first module

exchange below. If the

problem persists, reinstall

the original module and

perform the next

exchange:

* Replace the envelope
feeder controller board.

e Replace the envelope
feeder motor.

¢ Replace the printer

interface cable inside the

envelope feeder.

LaserWriter Printers, Vol. 2 71

Check

Table 28 No Pickup From Multipurpose Tray

Result

Action

Is paper picking up correctly from the
standard cassette?

No | Go to Table 29.

Is the following statement true?
Paper picks up correctly if you select
Multipurpose Tray in the Print dialog
box, but not if you select Manual
Feed.

Yes

With Manual Feed you
must feed paper a sheet at
a time following the on-
screen prompt, regardless
of whether there is already
paper in the multipurpose
tray.

Is the following statement true?

The pickup motor and gearing
engage after you try to print to the
multipurpose tray, but the
multipurpose pickup roller and guide
plate never move.

Replace the multipurpose
pickup solenoid.

Does the paper-out LED illuminate
even though there is paper on the
multipurpose tray?

Inspect the lever for the
multipurpose paper-
present sensor PS702
(see Figure 11). Ifis
broken or snagged, repair
or replace it as needed. If
the lever is OK, replace
the pickup sensor board.

Have you recently serviced the pickup

block and has this symptom existed
ever since?

You have probably not
reassembled the pickup
block correctly, especially
if you have removed any
of the gearing
components. Refer to the
Service Source left pickup
block frame take-apart
procedure for more
information. Take special
note of the components
between the multipurpose
pickup solenoid and the
guide plate spring.

LaserWriter Pro 600/630

Table 29 No Pickup From Standard Cassette (1 of 2)
[Sep [Check | Resutt [tion

Initiate a service test page. Does the Confirm that I/O cable
printer pick up from the standard connections are secure
cassette? and that configuration
settings are correct (refer
to the user's guide). To
make certain that
networking or CPU
software is not the root
problem, confirm through
the LaserWriter Utility that
the startup page is
enabled, and restart the
printer. If the startup page
prints, there is a software
or networking problem
away from the printer. If
the startup page does not
print, replace the I/O
board.

Yes | Confirm that the cassette
pickup roller is installed
correctly and is in good
condition. If the roller is
OK, replace the cassette
pickup roller solenoid.

Do the pickup motor and gearing
engage after you restart the printer?

Remove the rear panel, I/O shield, Secure the cable.
and right corner panel. Is the pickup
controller board cable securely
connected to J201 on the DC

controller board?

Is the DC controller board cable
securely connected to J601 on the
pickup controller board?

Secure the cable.

Is the pickup block motor cable Secure the cable.
securely connected at J703 on the

pickup sensor board?

Disconnect J201 on the DC controller
board. Place probes between pins
J201-1 (GND) and J201-13 (+24 V)
on the male connector on the board.
Does the voltage measure 24 V?

Replace the DC controller
board.

LaserWriter Printers, Vol. 2 73

Table 29 No Pickup From Standard Cassette (2 of 2)

Check Result Action

Place probes between pins J201-1 No Replace the DC controller

(GND) and J201-7 (+5 V) on the male
connector on the board. Does the
voltage measure 5 V?

board.

Reconnect J201. Remove the paper
pickup block and maintain pickup
connectivity. Place probes between
pins J601-11 (GND) and J601-13
(+24 V). Does the voltage measure
24 V?

Replace the pickup
controller-to-DC controller
board cable.

Place probes between pins J601-1
(GND) and J601-7 (+5 V). Does the
voltage measure 5 V?

Place probes between pins J601-1
(GND) and J601-9 (+24 V.) Does the
voltage measure 24 V?

1
Replace the pickup

controller-to-DC controller
board cable.

Replace the pickup
controller board.

Perform the first module

exchange below. Ifthe

problem persists, reinstall

the original module and

perform the next

exchange:

e Replace the pickup
motor.

¢ Replace the pickup
sensor board.

LaserWriter Pro 600/630

Table 30 No Pickup From Lower Cassette

Action

Is paper picking up correctly from the Go to Table 29.
standard cassette?

Remove the printer from the sheet Reinstall the pickup roller.
feeder. Is the pickup roller installed

as shown on the label affixed to the

sheet feeder housing?

Open the lid of the controller block. Is Unsnag or replace the arm
the sensing arm intact and free to as needed.

Reinstall the sheet feeder and restart Replace the sheet feeder

the printer. Do the sheet feeder pickup solenoid. If the

gearing and motor rotate? problem persists, go to
step 7.

Do you have another known-good If paper picks up from a
sheet feeder? known-good feeder, then
go to step 7.

Remove the printer from the sheet Replace the pickup
feeder. Remove the printer's top controller board.
cover, rear panel, and right corner
panel. Remove the 4-pin cable from Perform the first module
connector J603 along the front edge exchange below. If the
of the pickup controller board. Place problem persists, reinstall
probes between J603-1 (+24 V) and the original module and
J603-4 (GND) on the pickup controller perform the next
board. Does the voltage measure 24 exchange:
V when you switch on the printer? ¢ Replace the sheet feeder
controller board.
e Replace the sheet feeder

controller block.

e Replace the sheet feeder
motor.

e Replace the pickup
controller board.

e Replace the sheet feeder
interface cable.

7 Replace the sheet feeder controller Problem solved.
board. Does the problem persist?

Replace the sheet feeder controller Problem solved.

block. Does the problem persist?
Replace the sheet feeder
motor.

LaserWriter Printers, Vol. 2 75

Check

Result

Table 31 Leading Edge of Jammed Paper Is in Fuser/Delivery Area

Action

| Do the delivery rollers turn when you

start up the printer?

Go to Step 6.

Is there crumpled paper just outside
the exit point of the fuser assembly?

A snagged sensing lever is
probably the cause of the
problem. Remove the top
cover and delivery roller
assembly, and inspect the
delivery/interlock sensor. If
the delivery-sensing lever
is broken, replace it.

Is there accordion-style jamming just
short of the paper delivery tray?

The delivery guide pins
might have been installed
incorrectly. These are the
four small pins on the
delivery roller assembly.
They should point outward,
with the flow of paper.

Does jamming occur only when paper
feeds from the multipurpose tray?

Inspect the sensing lever
for multipurpose paper-end
sensor PS701. Unsnag or
replace it if it is damaged.
If the problem persists,
replace the pickup sensor
board.

Remove the rear panel and I/O shield.
Place probes between J208-2 (GND)
and J208-3 (PSNS) on the DC
controller board. Does the voltage rise
from 0 to 5 V as you open the fuser
access door?

Remove the rear panel and I/O shield.
Restart the printer and observe the
main motor. Does the main motor spin
when the printer starts up?

Replace the DC controller
board.

Replace the
delivery/interlock sensor.

Trace mechanical drive
components from the
delivery rollers back to the
main motor, taking special
note of the delivery drive
belt. Clean or replace parts
as necessary.

Make sure that the main motor is
secure at J211 on the DC controller
board, then run the printer diagnostic
(see "Printer Diagnostic"). Does the
diagnostic indicate a main motor error?

pam

Go to Table 8.

Check main motor drive
components for binding or
improper installation.
Clean or replace parts as
required.

LaserWriter Pro 600/630

Try printing with Known-good paper.
Does the problem persist?

Try feeding the paper from one of the
other paper sources. Does jamming
still occur?

Remove the toner cartridge, hold the
green knob, and lift the delivery
guide. Does the registration sensor
arm move back and forth freely when
you flick it with your finger?

Check for obstructions, especially
beneath the upper guide plate
situated between the pickup block
and the transfer roller. Are there
obstructions?

Is the trailing edge of the jammed
paper about an inch short of the
registration sensor arm?

Remove the paper pickup block from
the printer and maintain pickup
connectivity. You will be taking
measurements from the solder-side of
the pickup controller board.

Place probes between J605-5 (GND)
and J605-6 (RESS) and manually trip
the registration sensor arm. Does the
voltage measure about 5 V (normal)
and 0 V (tripped)?

LaserWriter Printers, Vol. 2

Table 32 Leading Edge of Jammed Paper Is in Pickup/Transfer Area

Action

Problem solved.

Go to Table 33, 34, 35, or
36, as applicable.

Clear it if possible. If the
arm is snagged beyond
repair, replace the sensor
holder assembly.

Clear the obstructions.

If paper has jammed there,
especially if there is no
sign of crumpling, there is
almost certainly a failure in
the delivery sensing
system. Go to Table 31.

Replace the pickup
controller board.

Replace the sensor holder
assembly.

Table 33 Paper Jams in Pickup/Transfer Area When Feeding From the
Standard Cassette

Result Action

Is the black ribbed paper guide firmly No Reseat the black ribbed
seated? paper guide. If this guide
is damaged or unseated,
paper may jam at the
entrance to the paper
pickup block.

Is the white passive roller on the Clean the roller so that it
cassette OK? forms a smooth gripping
surface against the lower

feed roller.

3 [is the lower feed roller OK? Replace or reinstall the
lower feed roller and /or its
gearing. Note that the
upper feed rollers serve
other paper sources, so
they are not likely to be the
cause of the problem.

Table 34 Paper Jams in Pickup/Transfer Area When Feeding From the
Multipurpose Tray

Step il Check Result Action

1 Try printing with known-good paper. No Problem solved.
Does the problem persist?

2 Is the multipurpose tray width guide No Set the guide so that it is
set correctly? snug against the edge of
Me the paper.
3 Is the multipurpose pickup roller | Yes | Reinstall or replace the

slipping when it tries to pull in the multipurpose pickup roller.
paper? If you have recently taken
apart the pickup block
gearing and paper has not
fed successfully since
then, the problem could be
incorrect installation of the
gears.

Are there two sheets at the jam
location?

Replace the multipurpose
tray guide assembly.

78 LaserWriter Pro 600/630

Table 35 Paper Jams in Pickup/Transfer Area When Feeding From the
Optional Sheet Feeder

Is the black ribbed paper guide firmly Reseat the black ribbed

seated? paper guide. If this guide
is damaged or unseated,
paper may jam at the
entrance to the paper
pickup block.

Is the standard 250-sheet cassette Paper fed from the sheet

installed and in good condition? feeder passes through the
slit in the standard
cassette located 2 inches
back from the face plate.
Make sure the standard
cassette is fully inserted

and that no blockage
exists in this opening.

Are the feeder rollers in the sheet The sheet feeder has one

feeder OK? primary and two passive
feeder rollers. Because
power is reaching the
pickup roller, any problem
would probably be with
binding or obstruction in
the roller/gear system.
Perform the sheet feeder
bypass procedure and
observe the functioning of
the feeder components
(see Service Source for
additional information).

LaserWriter Printers, Vol. 2 79

Table 36 Paper Jams in Pickup/Transfer Area When Feeding From the
Envelope Feeder

Check Result

Action

Is the envelope feeder width guide set No
correctly?

Set the guide so that it is
snug against the edge of
the envelopes.

Is the envelope feeder correctly
installed into the printer?

Reinstall the feeder so that
it is mounted solidly onto
the black positioning pin in
the upper-left corner of the
pickup block opening. If
the feeder isn't mounted
correctly, or if the pin is
damaged, the pickup block
entrance may not align

properly.

Have you recently taken the feeder
apart and has it exhibited this
problem ever since?

You may not have
reinstalled the gear/roller
system correctly. Refer to
Service Source for more
information.

Is the fork-shaped separation guide
installed correctly?

There should be a 1.5 mm
opening between the
separation guide and the
primary feed roller. Refer
to the Adjustments chapter
in the LW Pro Envelope
Feeder manual on Service
Source for more
information.

LaserWriter Pro 600/630

FUSER ASSEMBLY

PDS
1
J13

EXHAUST
FAN

LED
STATUS

TRANSFER HV
SUPPLY

DELIVERY/
INTERLOCK
SENSOR

J731
BEAM DETECT
IC UNIT

Service Test Cassette Size

OO
SW602 SW603/4/5
\ Page Switch Sensing Switches

A4 B4 A5 BS

Multipurpose
Pickup Roller
Clutch Solenoid

Cassette Size
Sensing Switches

| SL851
| Pickup Roller
t

Clutch Solenoid

SL701

Sheet Feeder |.
Paper-Present |2 BOARD Cassette Pickup Roller

J852 Sensor Clutch Solenoid

ee ee -aserWriter Pro 600/630
Wiring Diagram

LaserWriter Printers, Vol. 2

LaserWriter Select
300/310

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Exploded View 84
Parts List 86
I/O Boards 89
Specifications 90
Status LEDs 92
Service Test Page 93
RAM Upgrade 96

Troubleshooting the
LaserWriter Select 300/310 97
Wiring Diagram 137

Exploded View

Output Tray LED Assembly Front Access
Backstop Door Cap
Right Side
Cover

Top

Output Tray cere

Extension Fuser Assembly
1/O Bracket (300)

I/O Bracket (310)

Left Side

Cover /O Shield

/O Controller

I/O Board (310) Board Mount

DC Controller
Board

High-Voltage
Power Supply

Mount Drive Assembly
= )
cD Power
: so — Sage
oy
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$ Scanner
a Motor Laser/Optic
2 Assembly
= Power
= Switch Lever
& Cassette Feeder

Left Cover Board

Bracket

High-Voltage
Contact
Assembly

Universal Cassette

Figure 1 LaserWriter Select 300/310 Exploded View (1 of 2)

84 LaserWriter Select 300/310

Toner
Cartridge

Paper Separation

Figure 1 LaserWriter Select 300/310 Exploded View (2 of 2)

LaserWriter Printers, Vol. 2

Parts List

500 sheet feeder cassette (A4) oo... ceececceeeeaeeeeseeeneueeeeeeseneans 922-1110
500 sheet feeder cassette (letter) 00.0... eeeeccccceeeceeeeeueueeeseeeerenes 922-1111
500 sheet feeder left DOttOM COVEF ............... cc ceeeseeseeseseesseeeeeeeeeeeseens 922-0650
500 sheet feeder right DOttOM COVET ..............cccceseesssesessneeeeeeeeneeeerene 922-0651
500 sheet feeder rear COVET...............c:cccsccsceeeseeeecstscessssserssseseseseneess 922-0652
BOAly GElLECE CAD 6 ii ices: carnssnnchetnenonta aie eedsacamaainuckiutreteadagesweenceae 922-1010
CADIS GUIASy vosensaceisntcas adahiceanctehannta leans habitat uate Gh oxesttaeeeguamaawsauauadeus 922-1079
Cassette feeder Cable oo... cccccccccccseeceesseessseseeeeeeeeecceseussusesesseas 922-1073
Cassette feed roller Shaft...................cc cc csessssessseesseseeeeeseeseeeseseseeeeeees 922-1087
Cassette feed SOIQNOIG ................ cc ceecessssssssesseesseseesescceceececesereeeseneess 922-1007
Optional cassette feeder board...................ccesessesesseeeceeeeeeeeseseeeseneess 922-1004
Cassette feeder DOard .............cccc ce ceeeeeesssesseeeteseteeesssesssecsesseeeseseseees 922-1003
Cassette gear T21/36 ........cceeeseeesesssssrssssssssessssssssseseesesssseeeeees 922-1090
Cassette: gear 32 (ivctiaiseretaacnemuashstteeeninihicad av Oa rabreterates 922-1089
Cassette Gear: 141. i issicyicxisachcoswnten wavudnastion ch ve zeeenrcsteeacuesdy ahaa badlanviies 922-1088
Cassette Grounding SPring...............cccccccceeseesesssesscseeesesceseeeeeseeseseeens 922-1092
Cassette pickup roller Shaft ...............cccceceessssseseeeeeeeeseeeeeeeeseeeeeneas 922-1085
Cassette pickup rollers ..............ccccccccsssscssssesessssssssessessesersssesssseseeeees 922-1086
Cassette pickup SOICNOIC...............0...::cceessssseseeseeesessseeeseceseeseceseeeess 922-1006
Cassette roller DUSHINGS ..............cceeccscssccecceesessseeeeeeeeceessseeueeeesenens 922-1095
Cassette SiZ@ ACtUATOF ......... ccc ccccccccessceeeeeesesesaseeseceessreueeeueveneeneas 922-1091
DC controller DO@rd..........ccccccccssessssseessceceeeesseueeuseeteseucneseesenenneens 661-2002
DRIVGTASSOTIOY caprses estistaeacorson fucpisugaichas canededu enters Samed ldenaepaumnnenenee et 922-1069
Drive ASSEMbIy SCrEW Kit ...... cc cccccceceeeeeseeeeeseeeeeeeeeeeueenaceneneaneas 076-2003
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FIORLACCESS COO fas pisiad ous eisvagencd lad awten cvieoeeanan tated ani coeeeadeenamteennne 922-1026
FrOMt ACCESS GOOF CAP ...........cccccccsseeccccseusssseeeceeeccecesteucenssseesseaveserss 922-1016
FOP ACCESS GOOMCOVEP casredascisiiviaguidvevoenvaivveieesaatasiadbarincemsdenecateavonae 922-1015
PROM OCOlQCAN saiiiataeod ctnc?s aedioctaratilmeninwesngtebanniouceodtnmieal ne tumninete 922-1074
Front GOOr Ground Spring ...........cccccccececssesseesececeeeeseeeeaneesesesecesuuenenas 922-1044
Fuser assembly (110/115V).........ccccccccccceccceseesseeeeevseseseeeueuesnaaeenes 661-2008
Fuser aSSembly (220/240V) 0... cccccccccssseecceceeeeueeeseesseuaeeececesensaesess 661-2009

Delivery SENSOF IVER... ccceccccccccccccccecceseeeeeeeeeeueeeneeusunesueueaseenaas 922-1051

Engine therMoOprotector .........ccccccccccceccccceceeeceteeeceeseseusueeueueeeananeeas 922-1061

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Fuser delivery roller ...............:cccccccesescccccsssesvaueucecsacsuacecsenveseeeeesans 922-1052

Fuser heater bulb 110/115V .0........ccsssesseveeesecesssseecssseseeseees 922-1047

Fuser heater bulb 220/240V 0.0... ccccccccccceccecceeeeeeeseeeececeeseesseneaas 922-1048

Fuser Neater roller ...............:ccccccccccsssecsevsseeceesecuccaceneasssnceveeeeceanacs 922-1049

Fuser heater roller Q@ar .............ccccccccesesseseeceeecceeeeseueuececeeeeeaeesuaes 922-1050

LaserWriter Select 300/310

FUSCR DADGl QuIde sects ise: doncencenetssaneudeatetscenacnulmave tecenscaviesvenbanenautee 922-1053
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FUSER TOD COVON cezcaereeciuceesee eotasesia coe anderen eesti e ane e 922-1055
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Pressure roller Dearing auscidicter taney oiiaiieenestn cs peers diviaenaa 922-1058
Pressure roller Spritng.................:cccccseeseeeeceeceseeeeeeeeeeeeteaseeaseereenees 922-1059
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Temperature Sensor 110V ........ cc cceeecccseseeeeeeseeenseeeessaneeseseneesenas 922-1056
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High-voltage contact ASSEMDIY .......... eee eee eeeeeeeeeeeeeeeeeeeeteneeenenees 922-1105
High-voltage power SUPDIY ........... cc cceeecccecsesseeeeesseesseeeeesueseeeeeneaeetees 661-2005
High-voltage power supply and toner sensor cable..................0008 922-1009
I/O bracket (LaserWriter Select 300) ...............cccccesseeeeceeesseeeeeneeesees 922-1082
I/O bracket (LaserWriter Select 310) ............ccccceccssseeeeeesesseeeseneeeaees 922-1083
I/O board (LaserWriter Select 300) ...................cccecceceeeceeeeeeeeeeeeeeenens 661-2000
I/O board (LaserWriter Select 310) ..............cccccceccecsseeesseseeeeseeeeseeeees 661-2001
©: DOard MOUNT shsstsesaleventeteied.wecteanthatiaaeasdeapuasersatwanectcaevellinnnns 922-1080
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EASEI/ODTIC. ASSOMDIY waiwisiavesssaeehondauiseerddapesnvarnintegtusstenteiaetentnecstcenton: 661-2003
Laser/scanner Motor Cable .................ccccceceeeeeeeceeeeeeeeeeeeeseeseesenenanaes 922-1008
EB DASSOM DIV va ceicusctes tance utinse nck te eater ence os in vne ce pses en nceeaaanaceenauiiaae 922-1033
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LOT COU DIS: QO ae iessittse taints ce petunassmenad wai newpnceatApaetet eeseteeeriapvaevn est 922-1076
Left release lOVEF 00... csecsecccecsseseescecseneeeeceensnsseeteessoseeesensoseess 922-1024
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LOG al: CASSONG sft sssccmnetisamasnctnasndndedartutieiai iets riendie aeons 922-1102
MAILE TN OLON 6 ts ena Ure tehce dati er etetdandl med euaeticeetua hanes el eianinins tenets 922-1000
Manual feed pickup plate ............ ce ccccesssseeeeceesneeeeecssaeseseeeusaeaeeees 922-1032
Manual feed piCKUP SOICNOIG ............ ee cecsesseeecccteeeeceecseaeeceecessesseeess 922-1005
Manual T6GG Fam p siioecccutietierstearietisulavaicvideas vane dasanceees eunameaunseeatee 922-1023
Mantel 166G SONSOM sisciaccccivagsicesdseladececinebniieuiessanciascucassseatoeecattoassane 922-1039
Manual feed S@NSOF AMIN .............cccccccssssssseeeceeeeceseeacssseeeeeeeecseeaeassees 922-1037
Manual feed SENSOF SPFiNg ...............:cccccccessseeeceeeeeeeecseeesseneeseaaseeeess 922-1038
Maniial 1666: ay ses ivecs caren etinvevevedacienannwanneahesactnuinnaaseewennnenmonen 922-1017
Manual feed tray Extension. ............cccccccccsssssseeeecsesseeeecsseessesecseaaeeees 922-1019
Optional f6SGSr Cli caccsscasicscx-sesesndansdsescves aatoinis eadeieavanseincneeneaeavenes 922-1098
Optional feeder COMMECHON 20.0... cccccceeeseceeeecesseeeseessseesssensssssesseseess 922-1096

LaserWriter Printers, Vol. 2 87

Optional feeder grounding Spring ..................cccceeeeeeeeeeeeeeeeeeeeeeeeeetees 922-1097

Output Tray DACKSLOD sis. cute ivcdinerdindeaunladcaieidiwadeues 922-1022
Output ray CXC SiON 2s iret ett cine elise a alanis tee hte Gat heats 922-1018
Paper Charge: dene ctor sisi acuscsascastegcdvaey cadee isveodov acer soansueoue averedveeve dacs 922-1040
Paper registration AN iciscsiniciunecetinntaanlnawsun 922-1043
Paper registration SENSOLM............:cceeeceeeeeeeeeeeeeeeeeeeneeeeseneaaneneeees 922-1041
Registration SENSOFr SPIing ............cccceececceeeeecceeeeeeceeeeeeeceeeeeeenees 922-1042
Paper delivery Quide ..............cccccecccssssececseseeeecseseccensneeceneesecensenseensees 922-1027
Paper delivery SONSOL .............cccccccccsssssceccsseeeecueseeceususeeenenseeeenanseessees 922-1071
PICKUD Olle FrASSEMDIY szccucdssarcateurovsral nodes eaiebbeseseratasbraauieatenadetaeennes 922-1030
PICKUB: FOUCES -tasscbsceraeercageatwedson dus duav Gareesneaevadsc eran loiaaioayzeonenncmpdense 922-1031
FADE! SENSING Al nxtieceactnesasaetutob aiaioahedsesdancicet ean anidedomiuanombrndiaanes 922-1084
Paper Separation ASSEMDIy ............. cece cccseeccecseeeeeeeaeeeeeseeseeseaeeeeneees 922-1034
PADEr TEE: TONGS iaisiticti cari naclsaswauarveadedebadescnsie tamara tountecuet veeianeteane ls 922-1029
Paper S€paration Pad ..............ccccccsscccenecceeeseccesccsaseceseeeeeseesenseeees 922-1035
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LaserWriter Select 300/310

/O Boards

DRAM

P50 P51 SIMMs

Figure 2 LaserWriter Select 300 I/O Board

ROMs SIMMs

J3 JP2 DRAM

Figure 3 LaserWriter Select 310 I/O Board

LaserWriter Printers, Vol. 2 89

Specifications

Print Engine Specifications

Marking
Engine

Fuji Xerox PO engine

Print
Resolution

Paper Feed

Print Materials

Paper

Capacities

Printable
Surface

Dimensions

Operating
Requirements

Power
Requirements

300 dots per inch (dpi)

5 pages-per-minute maximum; actual performance depends on
the application

Input: Automatic with paper cassette; automatic or manual with
universal tray
Output: Face-down

Sizes: letter, legal, A4, B5
Media: 20- to 28-lb. bond paper, letterhead and colored stock,
medium-weight transparency material, envelopes, and labels

250-sheet universal cassette: letter, A4, B5
250-sheet legal cassette: optional
Envelope cassette: optional

Letter size: 8.0 x 10.5 in.

Legal size: 8.0 x 13.0 in.

A4: 7.41 x 10.86 in.

B5: 7.69 x 10.16 in.

Printable area may vary depending upon application

Height: 8.0 in. (25.3 cm)
Width: 15 in. (88 cm)

Depth: 18.3 in. (46.5 cm)
Weight: 26.4 Ib. (12 kg)

50-—90.5° F (10—32.5° C)
20-80% relative humidity

U.S./Japan: 100-115 VAC, 50-60 Hz
Europe/Australia: 220-240 VAC, 50 Hz

LaserWriter Select 300/310

/O Board Specifications

Select 300 Select 310
Processor AMD Am29205; 16 MHz

DRAM 512K, expandable to 1.5 MB 1.5 MB, expandable to 5.5 MB
or 4.5 MB

pROM 32K 1 MB, expandable to 2 MB

RS-422 RS-232; Centronics parallel
connector

Imaging QuickDraw PostScript
Languages
Supported

Built-in Fonts 39 fonts from the following 13 fonts from the following font
font families: Avant families: Courier, Helvetica,
Garde, Bookman, Times, and Symbol.
Chicago, Courier, Additional PostScript fonts
Geneva, Helvetica, can be downloaded to printer
Helvetica Narrow, memory.

Monaco, New Century
Schoolbook, New York,
Palatino, Symbol, Times,
Zapf Chancery, and Zapf
Dingbat.

LaserWriter Printers, Vol. 2 91

Status LEDs

OO L) wv

Figure 4 LaserWriter Select 300/310 Status LEDs

The LaserWriter Select has three status LEDs (see Figure 4) located on the top
of the printer's front access door:

¢ — Ready — The green Ready LED flashes during printer warmup and when
the printer is operating. The LED is steady when the printer is warmed
up and ready to print. The LED is off when the printer is not ready, an
error condition exists, or the top cover is open.

¢ — Paper-Out — The red Paper-Out LED is on and steady when the printer is
out of paper or the paper tray is missing. The LED flashes when the
printer is ready to accept manually fed paper.

¢ — Paper-Jam — The red Paper-Jam LED comes on when paper jams inside
the printer. The LED remains on until the jam is cleared.

The status LEDs may indicate an error condition within the printer or with the
print job. If an error condition exists, the status LEDs indicate the specific
error by varying the state of the LEDs (blinking, solid, etc.) These error
conditions are driver-specific and may vary depending upon the specific CPU.
Check the status of the printer under the Print Monitor of your computer
system to determine the specific error condition.

LaserWriter Select 300/310

Service Test Page

The LaserWriter Select service test page consists of a line matrix, as shown in
Figure 5. The LaserWriter Select printers produce a service test page when
you jumper pins P32-1 and P32-2 on the DC controller board. The service test
page confirms print engine operation.

= |

Figure 5 Service Test Page

Note LaserWriter Select 300/310 printers do not produce a startup test page
(a page produced when the laser printer is initially switched on).

LaserWriter Printers, Vol. 2 93

Figure 6 Generating a Service Test Page With I/O Board Intact

To generate a service test page with the I/O board and mount intact, follow
these steps:

1. Remove the printer covers.

2. Plug in the printer and switch it on. Wait until the delivery rollers stop
rotating.

3. Insert a straightened paper clip in the hole on the back of the I/O board
mount, as shown in Figure 6. Move the paper clip back and forth to
jumper P32. Remove the paper clip when you hear the fan come on and
the transfer rollers begin to rotate. A few seconds later the test page will
appear.

To generate a service test page with the I/O board and mount removed, follow
these steps:

1. Refer to the Troubleshooting Preparation section under
"Troubleshooting the LaserWriter Select." Follow steps 1 through 3.

2. Plug in the printer and switch it on. Wait until the delivery rollers stop
rotating.

3. Using a paper clip or jeweler's screwdriver, jumper the two pins at
connector P32. (Refer to Figure 7.)

LaserWriter Select 300/310

Screwdriver

—_N DC Controller
SSS Board
©

Figure 7 Generating a Service Test Page With I/O Board Removed

4, In order to avoid a paper jam, remove the piece of paper that you
previously inserted into the paper delivery sensor (Troubleshooting
Preparation, step 3) as soon as the printed page begins to exit the fuser
assembly rollers.

LaserWriter Printers, Vol. 2 95

RAM Upgrade

The LaserWriter Select 300 has 512K of soldered DRAM. You can upgrade the
Select 300 to 1.5 MB by installing a 1 MB SIMM (70 ns or faster) in the DRAM
SIMM connector on the I/O board. You can upgrade the printer to 4.5 MB by
installing a 4 MB (70 ns or faster) DRAM SIMM.

The LaserWriter Select 310 has 1.5 MB of soldered DRAM. You can upgrade
the Select 310 to 2.5 MB by installing a 72-pin, 1 MB (70 ns or faster) SIMM in
the DRAM SIMM connector on the I/O board. You can upgrade the printer to
5.5 MB by installing a 72-pin, 4 MB (70 ns or faster) SIMM.

LaserWriter Select 300/310

Troubleshooting the LaserWriter Select 300/310

Before you begin troubleshooting, check the printer setup and operating
conditions described in the Pre-Power-On Checklist section. If the problem
persists, refer to the flowcharts later in this troubleshooting section.

The flowcharts direct you to perform various tasks and refer you to specific
troubleshooting tables. Perform each step in the troubleshooting tables in
order and refer as necessary to the wiring diagram that follows the tables.

Retry the printer each time you change its physical state—such as when you
replace a component—until the problem is resolved. If you replace a module
and the problem remains, reinstall the original module before proceeding to
the next step in the table.

Pre-Power-On Checklist

Verify that the following conditions are met before proceeding with the
troubleshooting flowcharts or tables:

e — Line voltage is OK (115 VAC + 10%).

e Printer is installed on a solid, level surface.

¢ Room temperature is between 50—90° F (10-32.5° C).

¢ Humidity is 20-80%.

e Printer is not located in a hot or humid area, near open flames, or in
a dusty location.

¢ — Printer is not exposed to ammonia gas.

¢ — Printer is not in direct sunlight.

e Printer is installed in a well-ventilated area.

¢ — Cables and connectors are OK.

¢ — Toner cartridge is installed and has toner.

¢ — Paper cassette is properly loaded with paper.

¢ — Paper is within specifications.

e — Front access door is closed.

LaserWriter Printers, Vol. 2 97

Note

Troubleshooting Preparation

In order to troubleshoot the inside of the printer, you must prepare the
printer as follows:

Remove the printer covers and I/O shield.
2. Remove the I/O board mount and set it at an angle on top of the power
supply, as shown in Figure 8.

Fuser Assembly

Paper Delivery
Sensor

Figure 8 Actuating the Paper Delivery Sensor

Be sure to leave the cables that run to the I/O board and the paper
delivery sensor connected.

3. Insert a folded piece of paper into the U of the paper delivery sensor (see
Figure 8 inset) in order to manually actuate the sensor and put the
printer in a ready state.

If you try to print a service test page or a page from the Macintosh while the
folded paper is in the paper delivery sensor, the paper will jam in the printer.
To avoid a paper jam, remove the folded piece of paper from the paper
delivery sensor as soon as the printed page begins to exit the fuser assembly
rollers. Once the printed page has completely exited the fuser, put the piece of
folded paper back in the delivery sensor if you wish to resume troubleshooting
the inside of the printer.

LaserWriter Select 300/310

LaserWriter Select 300 Troubleshooting Flowcharts

START

. Connect the printer to a Macintosh computer that is
using the LaserWriter Select 300 driver.

Open the printer and remove any paper jams.
Install the toner cartridge and fill the cassette tray.
Switch on the printer and the Macintosh computer
and wait 2 minutes.

Issue a Print Window or Print Directory command.

ao PON

Does the
printer print
froma
Macintosh?

Go to Flowchart 2,
LaserWriter Select 300
Print Engine Error.

Is the
print quality
OK?

Go to Figure 9,
Print Quality
Problems.

The printer is fully functional.

Flowchart 1 LaserWriter Select 300 Print Engine Check

LaserWriter Printers, Vol. 2

START

. Switch off the printer and disconnect it from the
Macintosh computer.

. Remove the top cover, rear cover, and side covers.

. Remove the I/O shield and I/O board.

. Plug in and switch on the printer.

Does
the fan Go to Table 2,

come on? No Power to Fan.

Does the
fuser bulb glow every
few seconds during
startup?

Go to Table 3,
Fuser Assembly
Failure.

Does the
main motor
rotate sometime
after startup?

Go to Table 1,
Main Motor
Failure.

Initiate a service test page.

Flowchart 2 LaserWriter Select 300 Print Engine Error (1 of 2)

100 LaserWriter Select 300/310

Go to Table 27, 28, 29,
or 30, depending
on the specific paper
transport problem.

Did the
printer deliver
a service test
page?

Did the

paper jam

inside the
printer?

Go to Table 4
or 5, depending
on the specific laser/
scanner malfunction.

Is the Go to Figure 9,
print quality Print Quality
OK? Problems

. Make sure cable connections are correct, secure,
and undamaged.

2. Confirm that the proper print driver is installed.

3. If the printer is connected to the Macintosh printer
port, open the Chooser and make AppleTalk
inactive.

. If the problem persists, replace the I/O board.

Flowchart 2 LaserWriter Select 300 Print Engine Error (2 of 2)

LaserWriter Printers, Vol. 2 101

102

LaserWriter Select 310 Troubleshooting Flowcharts

START

. Connect the printer to a Macintosh computer that
is using the LaserWriter Select 310 driver.

. Open the printer and remove any paper jams.

. Install the toner cartridge and fill the cassette tray.

Switch on the printer and the Macintosh computer

and wait 2 minutes.

ITA )

Does the
Go to Flowchart 4,
Ready LED glow LaserWriter Select 310

steadily after Print Engine Error.
warmup?

Yes

Open the File menu and choose Print
Window or Print Directory.

Does the
printer print
froma
Macintosh?

Go to Table 7
or 8, depending
on the specific I/O

board error.

Yes

Is the Go to Figure 9,
print quality Print Quality
OK? Problems.

. Place paper on the manual feed tray.

. Open the File menu and choose Print Window
or Print Directory.

. Select Manual Feed as the paper source in the
Print dialog box.

Go to Table 30,

No Paper Pickup From
Manual Feed or

Multipurpose Tray.

Does the
printer deliver
a manually fed
page?

Yes

The printer is fully functional.

Flowchart 3 LaserWriter Select 310 Print Engine Check

LaserWriter Select 300/310

START

Is the
Paper-Out
LED on?

Go to Table 13,
Paper-Out LED Lights
When There Is Paper.

No
Go to Table 27, 28, 29,
or 30, depending
on the specific paper
transport problem.

Is the Is the
Paper-Jam paper jammed
LED on? inside the
printer?

Go to Table 14,
Paper-Jam LED Lights
But No Jam
Has Occurred.

. Switch off the printer and disconnect it from the
Macintosh computer.

Remove the top cover, rear cover, and side covers.
Remove the I/O shield and the !/O board.

Plug in and switch on the printer.

PON

Does
the fan
come on?

Go to Table 2,
No Power to Fan.

Flowchart 4 LaserWriter Select 310 Print Engine Error (1 of 3)

LaserWriter Printers, Vol. 2

Table 3 No Paper Pickup from Cassette Tray

Step

Check

Result

Action

Have you set the printer for cassette-
feed in the Print dialog box?

Select the Cassette option
in the Print dialog box.

| No

| With the toner cartridge

2 Was the toner cartridge installed
before you plugged in the printer? installed, unplug the
printer and plug it back in
again.
3 Try printing with known-good paper. i) No Problem solved.
Does the problem persist?
4 Remove excess paper from the No | Problem solved.

—$>—————_—_—_—§-

cassette tray. Does the problem
persist?

Is the paper pickup roller worn or
deformed?

Replace the paper pickup
roller.

Replace the pickup solenoid on the No Problem solved.
controller assembly. Does the
problem persist?

ic Is the fuser assembly properly seated No Reseat the fuser assembly
and making good contact with the so that it makes good
controller assembly? contact with the controller

assembly.
8 Remove the fuser assembly and No Replace the fuser

measure the resistance between
connectors J204-1 and J204-2.

Does the resistance measure
approximately 440 KQ?

assembly.

164

Is there continuity between
connectors J103-1 and J103-2?

Yes

Replace the fuser
assembly.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

e Replace the controller
assembly.

¢ Replace the pickup

motor.

Personal LaserWriter 300

. Switch off the printer.
. Replace the I/O board, I/O shield, and covers.
. Reconnect the printer to a Macintosh computer.

. Switch on the printer and the computer.
. Open the File menu and choose Print Window
or Print Directory.

Go to Table 7 or 8,
depending on the
specific I/O
board problem.

Isa
printout of the active
window produced?

Yes

. Place paper on the manual feed tray.

. Open the File menu and choose Print Window
or Print Directory.

. Select Manual Feed as the paper source in the
Print dialog box.

Go to Table 30, No
No Paper Pickup From

Isa
printout of the active
window produced?

Manual Feed or
Multipurpose Tray.

Yes

The printer is fully functional.

Flowchart 4 LaserWriter Select 310 Print Engine Error (3 of 3)

LaserWriter Printers, Vol. 2 105

Important

Troubleshooting Tables

As you proceed through the steps in a table, remember to retry the
printer each time you change its physical state—such as when you
replace a module. If the problem remains, reinstall the original
module before proceeding to the next step in the table. Refer as
necessary to the wiring diagram that follows the tables.

Table 1 Main Motor Failure

Step
|

106

Check

Result

=
Is connector P14 on the DC controller |
| board making good contact?

Are there any obstructions in the drive
assembly gear train or paper path?

Inspect the drive assembly gear train
and replace any damaged gears.
(Check the gears on the drive
assembly, the fuser assembly, the
paper feed roller, and the cassette
feeder assembly.) Does the problem
persist?

Switch off the printer and connect a
multimeter between each of the
following pairs of pins:

°P14-1 (A-COM 24V) & P11-2 (GND) |
- P14-2 (B-COM 24V) & P11-2 (GND)

Does the voltage measure
approximately +24 VDC when you
switch on the printer?

Switch off the printer and connect the
multimeter between each of the
following pairs of pins on the DC
controller:

- P14-1 (A-COM 24V) & P14-3 (A)
- P14-1 (A-COM 24V) & P14-5 (/A)
- P14-2 (B-COM 24V) & P14-4 (B)
- P14-2 (B-COM 24V) & P14-6 (/B)

Does the resistance measure
approximately 5 Q?

Action

Reconnect P14 to the DC
controller board.

Remove the obstructions.

Problem solved.

Go to Table 11, Power
Supply Failure
(+24 VDC).

Replace the main motor.

Replace the DC controller
board. If the problem
persists, replace the main
motor.

LaserWriter Select 300/310

1 Is a toner cartridge installed in the
printer?

2 Is the AC outlet providing the correct
voltage?

Is connector P119 making good
contact with the paper delivery
sensor?

Inspect the paper delivery sensor.
Does the lever on the fuser assembly
cover the paper delivery sensor when
no paper is present and uncover the
sensor when paper passes through
the fuser assembly?

Connect a multimeter between each
of the following sets of pins and check
for the following voltages:

P11-10 (+24V, brown wire) and
P11-2 (GND, black wire) +24 VDC

P11-11 (+24V, brown wire) and
P11-2 (GND, black wire) +24 VDC

P11-12 (+24V, orange wire) and
P11-2 (GND, black wire) +24 VDC

P11-5 (+5VB, yellow wire) and
P11-2 (GND, black wire) +5 VDC

P11-6 (+5VA, blue wire) and
P11-2 (GND, black wire) +5 VDC

Are the voltages present when you
switch the printer back on?

Switch off the printer, connect a
multimeter between connectors

DC controller, and switch the printer
back on. Is the voltage approximately
+24 VDC?

LaserWriter Printers, Vol. 2

Table 2 No Power to Fan (1 of 2)

P18-3 (+24V) and P18-2 (RTN) on the

No Install a toner cartridge.

| No | Try another AC outlet.

Reconnect connector
P119 to the paper
delivery sensor.

Install the paper delivery
sensor so that it makes
contact with the delivery
sensor lever. If the
problem persists, replace
the delivery sensor lever.

Replace the power
supply.

Replace the fan.

107

Check

Result

Yd Table 2 No Power to Fan (2 of 2)

Action

Switch off the printer and disconnect
connector P119 from the paper
delivery sensor. Connect the
multimeter between connector
P119-2 (GND) and P119-3 (+5 VDC)
and switch on the printer. Did the
voltage measure approximately

+5 VDC when you switched on the
printer?

Check

Result

Check the cable
connections between
P119 and P16 on the DC
controller board. If the
connections are secure,
replace the DC controller
board.

Replace the paper delivery
sensor.

Table 3 Fuser Assembly Failure (1 of 2)

Action

Is a toner cartridge installed in the
printer?

Switch off the printer, connect a
multimeter between pins J101-2 and
J101-6 on the fuser assembly, and
switch on the printer. Does the
voltage measure between +90 and
+132 VAC when you switch on the
printer?

Install a toner cartridge.

Replace the power supply.

Switch off the printer, and disconnect
connector P11 from the DC controller
board. Measure the resistance
between connector pins P11-13
(STS) and P11-14 (GND). Is the
resistance between 200 KQ and 350
KQ at room temperature?

Replace the power supply.

Measure the resistance between pins
J101-2 and J101-6 on the fuser
assembly. Is the resistance less than
10 Q?

Replace the fuser heater
bulb and the
thermoprotector.

Connect a multimeter between pins
P11-1 (HEAT, red wire) and

P11-2 (GND, black wire). Does the
voltage measure about +4.2 VDC
when you switch on the printer?

Replace the power supply.

LaserWriter Select 300/310

Table 3 Fuser Assembly Failure (2 of 2)

Check Action

Connect a multimeter between Go to Table 9,
connector pins P11-1 (HEAT, red Temperature Sensor
wire) and P11-2 (GND, black wire) on Assembly Failure.
the DC controller board. When you

open and close the front access door,

does the voltage measure about +3.7

VDC with the door open and briefly

drop to 0 VDC about five seconds

after you close the door?

Switch off the printer and disconnect Replace the power
P111 from the high-voltage power supply.

supply. Connect a multimeter

between connector pins P11-5 (5VB,

yellow wire) and P11-2 (GND, black

wire) on the DC controller board.

Does the voltage measure about +5

VDC when you switch on the printer?

Switch off the printer and disconnect Replace the laser/optic
connector P12 from the DC controller assembly.

board. Does the fuser heater bulb
light when you switch on the printer?

Switch off the printer and disconnect Replace the DC
connector P15 from the DC controller controller board.
board. Does the fuser heater bulb

light when you switch on the printer?

Connect the multimeter between pins Replace the toner
P15-8 (5VB, yellow wire) and P15-9 cartridge sensor
(5V, orange wire) on the DC assembly.
controller board. When you remove

and insert the toner cartridge, does

the resistance change from 0 Q

(cartridge inserted) to infinity Q

(cartridge removed)?

Connect the multimeter between pins Replace the toner
P15-10 (EP CHECK, red wire) and cartridge sensor
P15-11 (GND, brown wire) on the DC assembly.
controller board. When you remove

and insert the toner cartridge, does

the resistance change from 0 Q

(cartridge inserted) to infinity Q

(cartridge removed)?

LaserWriter Printers, Vol. 2 109

Table 4 Laser Scanner Failure

Result

110

Check

Are connectors P12 and P19 on the
DC controller board properly seated?

Switch on the printer, wait until the
main motor stops rotating, and
connect a multimeter between
connector P12-11 (/MOT ON) on the
DC controller board and chassis
ground. Can you hear the scanner
motor start to spin?

Switch off the printer, connect a
multimeter between connectors P11-
4 (GND, black wire) and P11-5 (5VB,
yellow wire) on the DC controller
board, and switch on the printer. Is
the voltage approximately +5 VDC?

Switch off the printer and connect a
multimeter between P11-5 (5VB,
yellow wire) and P12-7 (5VB, black
wire) on the DC controller board. Is
the resistance less than 5 Q?

Switch off the printer and connect a
multimeter between connectors

P12-7 (5VB) and P12-6 (GND) on the |

DC controller board. Does the
voltage measure +5 VDC when you
switch on the printer?

Action

Reconnect connectors
P12 and P19 to the DC
controller board.

Go to Table 5, Scanner
Assembly Failure.

Replace the power
supply.

Go to Table 10, Toner
Cartridge Sensor Failure.

Replace the laser/optic
assembly.

Replace the DC controller
board.

LaserWriter Select 300/310

Table 5 Scanner Assembly Failure

Switch off the printer and connect a Go to Table 11, Power
multimeter between connectors Supply Failure (+24 VDC).
P12-13 (24V) and P12-12 (RTN) on

the DC controller board. Does the

voltage measure about +24 VDC

when you switch on the printer?

Connect a multimeter between Replace the scanner
P12-11 (/AMOT ON) and P12-10 assembly. If the problem
(GND) on the DC controller board persists, replace the laser
and initiate a service test page. Does and scanner motor cable.
the voltage drop to less than +1 VDC

during printing and rise to about Replace the DC controller
+4 VDC when the printing stops? board.

Table 6 Select 300 I/O Board Error

Is the printer currently connected to a Connect the printer to a
Macintosh computer? Macintosh computer.

== Is the serial cable connection secure? ete Tighten cable connections.

Is the LaserWriter Select 300 driver Use the Installer to install

installed in the System Folder? the LaserWriter Select 300
driver in the System
Folder.

Are the LaserWriter Select 300 driver Use the Chooser to select

and correct serial port selected? the LaserWriter Select 300
driver and the port (printer
or modem) to which the
printer is connected.

Is the printer connected to the printer Make sure that AppleTalk
port on the Macintosh computer? is inactive.

Is background printing disabled? Disable background
printing (so that error
messages display on the
screen). Switch the printer
off and on again.

Install a different
LaserWriter Select 300 I/O
board.

LaserWriter Printers, Vol. 2 411

Table 7 Select 310 I/O Board Error — Serial Connection

Check Action

Is the serial cable connection secure? Tighten cable connections.

Is the serial cable good? Replace the cable.

Is the LaserWriter Select 310 driver _| Use the Installer to install
installed in the System Folder? the LaserWriter Select 310
driver in the System
Folder.

Are the LaserWriter Select 310 driver Use the Chooser to select
and correct serial port selected? the LaserWriter Select 310
driver and the port (printer
or modem) to which the
printer is connected.

Is the printer connected to the printer | Make sure that AppleTalk
port on the Macintosh computer? is inactive.

Is background printing disabled? Disable background
printing (so that error
messages appear on the
screen). Switch the printer
off and on again. If the
problem persists, install a
different LaserWriter
Select 310 I/O board.

Table 8 Select 310 I/O Board Error — Parallel Connection

Check Result Action

Are the parallel cable connections No | Tighten cable connections
correct and secure? or refer to the printer's
user guide for proper
cabling information.

Are the parallel cables and Replace the defective
connectors good? cables and connectors.

Are the software and hardware Refer to the printer's
properly configured to communicate owner's guide and the
with the parallel port on the printer? computer documentation
for proper configuration
information. Switch the
printer off and on again.
If the problem persists,
install a different I/O
board.

112 LaserWriter Select 300/310

Table 9 Temperature Sensor Assembly Failure

Replace the sensor
assembly.

After allowing the fuser assembly to
cool to room temperature, remove the
fuser assembly from the printer.
Measure the resistance between
J101-1 and J101-4 on the fuser
assembly. Is the resistance between
200 kQ and 350 kQ?

Table 10 Toner Cartridge Sensor Failure (1 of 2)
Action

Go to Table 12, Power
Supply Failure (+5VDC).

Switch off the printer. Connect a
multimeter between P15-8 (5VB) and
P11-2 (GND) on the DC controller
board. Does the voltage measure +5
VDC when you switch on the printer?

Connect a multimeter between pins Replace the toner
P15-8 (5VB, yellow wire) and P15-9 cartridge sensor
(5V, orange wire) on the DC assembly.
controller board. When you remove

and insert the toner cartridge, does

the resistance change from 0 Q

(cartridge inserted) to infinity Q

(cartridge removed)?

Connect a multimeter between pins Replace the toner
P15-10 (EP CHECK, red wire) and cartridge sensor
P15-11 (GND, brown wire) on the DC assembly.
controller board. When you remove

and insert the toner cartridge, does

the resistance change from 0 Q
(cartridge inserted) to infinity Q
(cartridge removed)?

Install a new toner
cartridge. If switches
$101 and $100 still do not
turn on when you install
the cartridge, replace the
toner cartridge sensor
assembly.

Remove the toner cartridge sensor
cover and observe the toner cartridge
sensor PCB and actuator.

Does the actuator turn on switches
$101 and S100 when you install a
toner cartridge and turn off the
switches when you remove the toner
cartridge?

LaserWriter Printers, Vol. 2 113

Table 10 Toner Cartridge Sensor Failure (2 of 2)

Result

Is there continuity between
connectors P15 on the DC controller
board and P118 on the toner
cartridge sensor board?

Action

Replace the DC controller
board.

Replace the high-
voltage/toner cartridge
sensor cable.

Table 11 Power Supply Failure (+24 VDC)

Step

114

Check

Switch off the printer. Connect a

/ multimeter between P11-12

(+24 VDC, orange wire) and P11-2
(GND, black wire) on the DC
controller board. Switch on the
printer. Is the voltage approximately
+24 VDC?

Switch off the printer. Connect a
multimeter between P11-10

(+24 VDC, brown wire) and P11-2
(GND, black wire) on the DC
controller board. Switch the printer
back on. When you open and close
the front access door, does the
voltage measure 0 VDC with the door
open and +24 VDC with the door
closed?

Switch off the printer. Connect a
multimeter between P11-11

| Result

Action

Replace the power supply.

Replace the DC controller
board.

Replace the power supply.

LaserWriter Select 300/310

Table 12 Power Supply Failure (+5 VDC)

Connect a multimeter between Replace the power supply.
the following pairs of pins on
the DC controller board: Replace the DC controller
board.
a) P11-5 (yellow wire) and P11-2
(black wire)
b) P11-6 (blue wire) and P11-2
(black wire)

Does the voltage measure +5 VDC
when you switch on the printer?

Table 13 Paper-Out LED Lights When There Is Paper (1 of 2)

Is the paper cassette installed and Remove the paper

does it contain paper? cassette tray and fill it with
paper. Reinstall the paper
cassette tray and make
sure it is seated properly.

Remove the paper cassette tray and Replace the paper sensing
inspect the paper sensing arm. Does arm.

the paper sensing arm appear to be

damaged?

While the paper cassette tray is out, Replace the cassette
inspect the paper cassette size feeder board.
actuators. Do any of the actuators

appear to be bent or damaged?

While the paper cassette tray is out, Replace the cassette
switch on the printer. Insert the paper feeder board.
cassette tray. Does the main motor

rotate when you insert the paper

cassette tray?

LaserWriter Printers, Vol. 2 115

Table 13 Paper-Out LED Lights When There Is Paper (2 of 2)

Result

Action

Prepare the printer for troubleshooting
as described in the Troubleshooting
Preparation section under
"Troubleshooting the LaserWriter
Select." Disconnect P111 from the
high-voltage power supply.

Connect a multimeter between
connector pins P13-1 (NOPAPER1)
and P13-4 (GND) on the DC controller
board. Remove and insert the paper
cassette tray filled with paper. Does
the voltage toggle +5 VDC (tray
removed) to 0 VDC (tray inserted)?

Replace the cassette
feeder board. If the
problem persists, replace
the cassette feeder tray
cable.

Replace the DC
controller board.

If an optional paper cassette is
installed, connect a multimeter
between connector pins P13-3
(NOPAPER2) and P13-4 (GND) on
the DC controller board. Remove and
insert the paper cassette tray filled
with paper. Does the voltage toggle
from +5 VDC (tray removed) to

0 VDC (tray inserted)?

Replace the cassette
feeder board. If the
problem persists, replace
the expansion feeder
cable.

Replace the DC
controller board.

Table 14 Paper-Jam LED Lights But No Jam Has Occurred (1 of 3)
Check

Action

Is the paper cassette installed and
does it contain paper?

Remove the paper
cassette tray and fill it with
paper. Reinstall the paper
cassette tray and make
Sure it is seated properly.

Check the fuser/delivery area or
paper registration area for paper
fragments. Are there any paper
fragments or other obstructions?

Remove the fragments or
obstructions.

116

Is the cable that runs to the paper
delivery sensor securely connected?

Reconnect the cable to the
paper delivery sensor.

LaserWriter Select 300/310

Table 14 Paper-Jam LED Lights But No Jam Has Occurred (2 of 3)

Tsp [Check Resa | atin

Initiate a service test page and
observe the action of the delivery
lever on the fuser assembly.

Replace the delivery
sensor lever.

Does the delivery lever swing freely
when it passes through the fuser
assembly?

Open the front access door and
locate the paper registration on the

paper charge deflector. Is the paper
registration arm damaged or broken?

Replace the paper
sensing arm.

4
6
7

Switch off the printer and reconnect
connector P16 to the DC controller
board. Connect a multimeter
between connector P16-6 (PreReg)
and P16-5 (GND) on the DC
controller board. Initiate a service
test page. Does the voltage drop
from +5 VDC to 0 VDC when the
paper passes the paper registration
sensor?

Go to Step 9.

Prepare the printer for Go to Step 9.
troubleshooting as described in .
"Troubleshooting Preparation."

Disconnect connector P111 from the

high-voltage power supply and

connector P16 from the DC controller

board.

Connect a multimeter between

P16-4 (PULLUP 5V) and P16-5

(GND) on the DC controller board.

Does the voltage measure +5 VDC

when you switch on the power?

LaserWriter Printers, Vol. 2 117

Table 14 Paper-Jam LED Lights But No Jam Has Occurred (3 of 3)

Step Check

| Switch off the printer. Connect a
multimeter between P16-3 (EXIT) and
P16-2 (GND). Switch on the printer
and manually actuate the paper
delivery sensor by inserting a sheet of
paper between the sensor arms.

Does the voltage drop from +5 VDC
to 0 VDC when you remove the paper
from the sensor?

Switch off the printer and connect a
multimeter between each of the
following connector pairs on the DC
controller board:

a) P11-5 (5VB, yellow) and P11-2
(GND, black)

b) P11-6 (5VA, blue) and P11-2
(GND, black)

Does the voltage measure +5 VDC
when you switch on the printer?

118

Replace the paper delivery
sensor. If the problem
persists, replace the
delivery sensor cable.

Replace the power supply.

Replace the DC controller
board.

LaserWriter Select 300/310

All-Blank Page All-Black Page Light/Faded Image Dark Image
See Table 15 See Table 16 See Table 17 See Table 18

Black Vertical White Vertical Black Horizontal White Horizontal
Line(s) Line(s) Lines Lines
See Table 19 See Table 20 See Table 21 See Table 22

Ghosting Bad Fusing Blank Spots Toner on Back
See Table 23 See Table 24 See Table 25 See Table 26

Figure 9 Print Quality Problems

LaserWriter Printers, Vol. 2 119

Table 15 All-Blank Page (1 of 2)

Result

Check

Action

Remove the toner cartridge from the
printer. Is the toner cartridge sealing
tape removed?

Remove the sealing tape.

Replace the toner cartridge. Does the
print quality improve?

Problem solved.

Are the high-voltage contacts making
good contact with the toner cartridge?

Clean the contacts or
replace the high-voltage
contact assembly.

Remove the toner cartridge from the
printer. Is any foreign material
blocking the laser beam outlet on the
inside of the printer chassis? Is any
foreign material adhering to the laser
beam access slot on the toner
cartridge?

Remove the foreign
material.

Inspect the drive assembly gear train.
Are any gears damaged?

Replace the transfer roller. Does the
print quality improve?

Replace the drive
assembly.

Problem solved.

Connect the multimeter between
connectors P15-7 and P15-1 on the
DC controller board. Does the voltage
measure at +24 VDC when you switch
on the printer?

| Go to Table 11, Power

Supply Failure (+24 VDC).

120

For Steps 8 and 9, remove the top
covers, side covers, rear cover, I/O
board mount, and the power switch
lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage
contacts?

Replace the high-voltage
contact assembly.

LaserWriter Select 300/310

Table 15 All-Blank Page (2 of 2)

Check Action

Is there continuity between connector Replace the paper
RTN (red wire) on the high-voltage delivery guide.
power supply and the red spade

connector on the paper delivery

guide?

Replace the DC controller board. Problem solved.

Does the print quality improve?
Replace the toner
cartridge sensor and
high-voltage power supply
cable. If the problem
persists, replace the high-
voltage power supply.

Table 16 All-Black Page

Replace the toner cartridge. Does the Problem solved.

print quality improve?

Clean the contacts or
replace the high-voltage
contact assembly.

Are the high-voltage contacts making
good contact with the toner cartridge?

Go to Table 11, Power
Supply Failure (+24 VDC).

Connect the multimeter between
connectors P15-7 and P15-1 on the
DC controller board. Does the voltage
measure at +24 VDC when you switch
on the printer?

Is there continuity between CRU No Replace the high-voltage
Yes
Yes
No

(spring plate) on the high-voltage contact assembly.
contact assembly and jack CR on the
high-voltage power supply?

Replace the toner cartridge
sensor and high-voltage
power supply cable.

Is there continuity between P15 on the
DC controller board and P111 on the
high-voltage power supply?

Replace the DC controller board. Problem solved.
Does the print quality improve?
Replace the high-voltage

power supply.

LaserWriter Printers, Vol. 2 121

Check

Table 17 Light/Faded Image (1 of 2)

| Result |

_ print quality improve?

, Reload the paper cassette tray with
| known-good paper. Does the print
| quality improve?

Replace the toner cartridge. Does the |

| Problem solved.

Problem solved.

_ Remove the toner cartridge from the
printer. Is any foreign material blocking
the laser beam outlet on the inside of
the printer chassis? Is any foreign

' material adhering to the laser beam

| access slot on the toner cartridge?

Are the high-voltage contacts making

Replace the transfer roller. Does the
print quality improve?

Connect the multimeter between
connectors P15-7 and P15-1 on the
DC controller board. Does the
voltage measure at +24 VDC when
you switch on the printer?

For Steps 7 and 8, remove the top
covers, side covers, rear cover, I/O
board mount, and the power switch
| lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage
contacts?

Is there continuity between connector
RTN (red wire) on the high-voltage
power supply and the red spade
connector on the paper delivery
guide?

good contact with the toner cartridge?

Remove the foreign
| material.

I na eee
No Clean the contacts or
replace the high-voltage
contact assembly.

Problem solved.

Go to Table 11, Power
Supply Failure (+24 VDC).

Replace the high-voltage
contact assembly.

Replace the paper delivery
guide.

LaserWriter Select 300/310

Table 17 Light/Faded Image (2 of 2)

Replace the DC controller board. Problem solved.
Does the print quality improve?
No _| Replace the toner
cartridge sensor and high-
voltage power supply
cable. If the problem
persists, replace the high-
voltage power supply.

Table 18 Dark Image Over Entire Page

Result Action

Replace the toner cartridge. Does the Problem solved.
print quality improve?

Is the transfer roller dirty? Replace the transfer roller.

Connect the multimeter between Go to Table 11, Power
connectors P15-7 and P15-1 on the Supply Failure (+24 VDC).
DC controller board. Does the
voltage measure at +24 VDC when
you switch on the printer?

Sn
Remove the top covers, side covers, Replace the high-voltage
rear cover, I/O board mount, and the contact assembly.
| power switch lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage
contacts?

Replace the DC controller board. Problem solved.
Does the print quality improve?
Replace the toner
cartridge sensor and high-
voltage power supply
cable. If the problem
persists, replace the high-
voltage power supply.

LaserWriter Printers, Vol. 2 123

Check

Result

Table 19 Black Vertical Lines

Action

Replace the toner cartridge. Does the
print quality improve?

Yes

Problem solved.

Replace the transfer roller. Does the
print quality improve?

Yes

Problem solved.

Remove the paper delivery guide. Is
the static eliminator on the paper
delivery guide properly grounded?

Connect the grounding
contact to the static
eliminator.

Remove the fuser assembly and
inspect the fuser heater roller. Are
there scratches on the fuser heater
roller?

Check

Result

Replace the fuser heater

roller or the fuser
assembly.

Action

Yes

Remove the foreign
material.

Inspect the paper path. Is any foreign

material blocking the paper path?

Remove the foreign
material.

Replace the toner cartridge. Does the
print quality improve?

Problem solved.

Replace the transfer roller. Does the
print quality improve?

Problem solved.

Remove the fuser assembly and
inspect the fuser heater roller. Are
there scratches on the fuser heater
roller?

Replace the fuser heater
roller or the fuser
assembly.

Replace the I/O board. Does the print
quality improve?

Problem solved.

LaserWriter Select 300/310

Table 21 Black Horizontal Lines

Check

Result

Action

Replace the toner cartridge. Does the
print quality improve?

Yes

Problem solved.

Are the high-voltage contacts making
good contact with the toner cartridge?

Clean the contacts or
replace the high-voltage
contact assembly.

Replace the transfer roller. Does the
print quality improve?

Problem solved.

Remove the fuser assembly and
inspect the fuser heater roller. Are
there scratches on the fuser heater
roller?

Replace the fuser heater
roller or the fuser
assembly.

Connect the multimeter between
connectors P15-7 and P15-1 on the
DC controller board. Does the
voltage measure at +24 VDC when
you switch on the printer?

Remove the top covers, side covers,
rear cover, I/O board mount, and the
power switch lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage
contacts?

Go to Table 11, Power
Supply Failure (+24 VDC).

Replace the high-voltage
contact assembly.

Replace the DC controller board.
Does the print quality improve?

Replace the toner cartridge sensor
and high-voltage power supply cable.
Does the print quality improve?

Problem solved.

Replace the high-voltage power
supply. Does the print quality
improve?

Replace the I/O board. Does the print
quality improve?

LaserWriter Printers, Vol. 2

Problem solved.

125

Table 22 White Horizontal Lines (1 of 2)

| print quality improve? |

3 | Are the high-voltage contacts making : No Clean the contacts or
- good contact with the toner cartridge? — _ replace the high-voltage
! ! _ contact assembly.

4 | Remove the toner cartridge fromthe . Yes Remove the foreign
| printer. Is any foreign material ! ' material.
blocking the laser beam outlet on the
| inside of the printer chassis? Is any
foreign material adhering to the laser
| beam access slot on the toner
| cartridge?

5 _ Replace the transfer roller. Does the Yes | Problem solved.
_ print quality improve? |

6 | Connect the multimeter between | No Goto Table 11, Power
~ connectors P15-7 and P15-1 onthe | _ Supply Failure (+24 VDC).

_ DC controller board. Does the voltage |
_ measure at +24 VDC when you switch -
on the printer? |

126 LaserWriter Select 300/310

Table 22 White Horizontal Lines (2 of 2)

7 For Steps 7 and 8, remove the top No Replace the high-voltage
covers, covers, rear cover, I/O board contact assembly.
mount, and power switch lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage

contacts?

Replace the paper delivery
guide.

Is there continuity between connector
RTN (red wire) on the high-voltage
power supply and the red spade
connector on the paper delivery
guide?

Replace the DC controller board. Problem solved.

Does the print quality improve?

No Replace the toner
cartridge sensor and high-
voltage power supply
cable. If the problem
persists, replace the high-

voltage power supply.

Replace the toner cartridge sensor Problem solved.
and high-voltage power supply. Does

the print quality improve?

Replace the high-voltage power Problem solved.
supply. Does the print quality

improve?

12 Replace the I/O board. Does the print Yes Problem solved.
quality improve?

LaserWriter Printers, Vol. 2 127

Table 23 Ghosting

Check

Result

Action

Replace the toner cartridge. Does the
print quality improve?

Yes

Problem solved.

Is the transfer roller dirty?

Yes

Replace the transfer roller.

Remove the fuser assembly and
inspect the fuser heater roller and the
fuser pressure roller. Are there
scratches on either roller?

Yes

Replace the fuser heater
roller, the fuser pressure
roller, or the fuser
assembly.

Connect the multimeter between
connectors P15-7 and P15-1 on the
DC controller board. Does the
voltage measure at +24 VDC when
you switch on the printer?

Go to Table 11, Power
Supply Failure (+24 VDC).

Remove the top covers, side covers,
rear cover, I/O board mount, and the
power switch lever.

Remove the high-voltage contact
assembly and check the continuity on
all the high-voltage contacts. Did you
find continuity on all the high-voltage
contacts?

Replace the high-voltage
contact assembly.

128

Replace the DC controller board.
Does the print quality improve?

Problem solved.

Replace the toner
cartridge sensor and high-
voltage power supply
cable. If the problem
persists, replace the high-
voltage power supply.

LaserWriter Select 300/310

Table 24 Bad Fusing

Check the paper in the paper cassette Replace the paper.
tray for dampness. Is the paper
damp?

Is the fuser assembly properly Reinstall the fuser
installed and secure? assembly.

Install a known-good fuser assembly. Problem solved.
Does the print quality improve?

Install a known-good power supply.
Does the print quality improve?

Install a known-good DC controller Problem solved.
board. Does the print quality
improve?

Table 25 Blank Spots/Random Pattern or Location

Replace the toner cartridge. Does the Problem solved.
print quality improve?

Check the paper in the paper cassette Replace the paper.
tray for dampness. Is the paper
damp?

Is the transfer roller dirty? Replace the transfer
roller.

Remove the fuser assembly and Replace the fuser heater
inspect the fuser heater roller and the roller, the fuser pressure
fuser pressure roller. Are there roller, or the fuser
scratches on either of the rollers? assembly.

LaserWriter Printers, Vol. 2 129

Table 26 Toner on Back of Page

Check Result Action

Replace the toner cartridge. Does the Yes Problem solved.
print quality improve?

Does the printer operating No Make recommended
environment meet recommended changes to printer

setup and operation conditions? operating environment or
setup. See the Pre-
Power-On Checklist
section under
"Troubleshooting the
LaserWriter Select" for
recommended setup and
operating instructions.

Is the transfer roller dirty? Replace the transfer
| roller.

130 LaserWriter Select 300/310

Table 27 Paper Jams in Fuser/Delivery Area

Check

Initiate a service test page. Does the
test page jam as it leaves the fuser
assembly?

Result

Action

Problem solved.

Is the cable that runs to the paper Reconnect the cable to
delivery sensor securely connected? the paper delivery sensor.

Initiate another test page and observe
the action of the delivery lever on the
fuser assembly.

Does the lever swing freely when
paper passes through the fuser
assembly?

Allow the fuser rollers to cool and then
remove the fuser assembly. Inspect
the fuser rollers. Are the fuser rollers
worn or damaged?

Remove the I/O shield, the I/O board,
and the I/O board mount. Replace the
fuser assembly and disconnect P111
from the high-voltage power supply.

Connect a multimeter between
connector pins P16-1 (PULLUP +5 V)
and P16-2 (GND) on the DC
controller board. Does the voltage
measure +5 VDC when you switch on
the printer?

Verify that the cable that runs to the
paper delivery sensor is still securely
connected. Connect a multimeter
across connector pins P16-3 (EXIT)
and P16-2 (GND) on the DC controller
board. Manually actuate the paper
delivery sensor by inserting a sheet of
paper between the sensor arms.

Does the voltage drop from +5 VDC to
0 VDC when you remove the paper
from the sensor?

LaserWriter Printers, Vol. 2

Replace the delivery
sensor lever.

Replace the fuser
assembly.

Go to Table 12, Power
Supply Failure (+5 V).

Replace the DC controller
board.

Replace the paper
delivery sensor. If the
problem persists, replace
the delivery sensor cable.

131

Table 28 Paper Jams in Paper Pickup Area (1 of 3)

Check Result

Action

Reload the paper cassette tray with No
known-good paper. Does the problem
still occur?

Problem solved.

—P

Does the jam occur when the manual
feed or optional multipurpose tray is
being used?

Go to Step 17.

Is the paper cassette installed
properly in the printer?

Reinstall the paper
cassette properly.

Is the paper cassette loaded with too
much paper?

Remove the excess
paper.

Are the cassette pickup rollers
damaged or worn?

Replace the cassette
pickup rollers.

Are the cassette feed rollers damaged
or worn?

Is connector P13 on the DC controller
board making good contact?

Replace the cassette feed
roller shaft.

Reconnect P13 to the DC
controller board.

Is connector P115 on the cassette
feeder board making good contact?

Reconnect P115 to the
cassette feeder board.

Are the cassette pickup and cassette
feed solenoids securely connected to
the cassette feeder board?

Reconnect P201 and
P202 to the cassette
feeder board.

Switch off the printer. Connect the
multimeter between P13-7 (+24V) and
P13-8 (TURN1). Does the resistance
measure between 220 and 240 Q?

Replace the cassette feed
solenoid.

Connect the multimeter between
P13-10 (+24V) and P13-11 (FEED1).
Does the resistance measure
between 110 and 130 2?

Replace the cassette
pickup solenoid.

132

Open the front access door and locate
the paper registration arm on the
paper charge deflector. Is the paper
registration arm damaged or broken?

Replace the paper
registration arm.

LaserWriter Select 300/310

Table 28 Paper Jams in Paper Pickup Area (2 of 3)

ee
Close the front access door and Go to Table 12, Power
disconnect P16 from the DC controller Supply Failure (+5 VDC).
board. Connect a multimeter between
connector pins P16-4 (PULLUP 5V)
and P16-5 (GND) on the DC controller

board. Does the voltage measure +5
Problem solved.

VDC when you switch on the power?

Replace the DC controller board.
Does the problem still occur?
15 Reconnect connector P16 to the DC Replace the paper
registration sensor
located on the paper

charge deflector.

controller board. Connect a
multimeter between pins P16-6
(/PREREG) and P16-5 (GND) on the
DC controller board. Initiate a service
test page. Does the voltage drop from
+5 VDC to 0 VDC when the paper
passes the paper registration sensor?

Open the front access door and
observe the rollers on the pickup roller
assembly. Are the pickup rollers worn
or deformed?

Replace the pickup
rollers.

Using a paper clip or screwdriver,
manually activate the manual feed
solenoid. Manually rotate the large
black gear on the pickup roller
assembly toward the manual feed
solenoid. Does the pickup roller
rotate without binding?

Replace the pickup roller
assembly.

Does the manual feed or multipurpose Yes Remove excess paper.

tray have too much paper? (The

manual feed tray holds one sheet of

paper at a time and the multipurpose

tray holds 50 sheets of paper.)

Is connector P17 on the DC controller No Reconnect connector P17

board making good contact? to the DC controller
board.

LaserWriter Printers, Vol. 2 133

Check

Table 28 Paper Jams in Paper Pickup Area (3 of 3)

Result Action

| Disconnect P111 from the high-
voltage power supply. Connect the
multimeter between connector pins
P17-1 (424 V) and P11-2 (GND) on
the DC controller board. Does the
voltage measure +24 VDC when you
switch on the printer?

No Go to Table 11, Power
Supply Failure

(+24 VDC).

Connect the printer to a Macintosh
computer and place a sheet of paper
on the manual feed or multipurpose
tray. Connect the multimeter between
connector pins P17-2 (+24 V) and
P11-2 (GND) on the DC controller
board. Select Manual Feed and print
a page. Does the voltage drop from
+24 VDC to 0 VDC when the manual
feed pickup solenoid is actuated?

Check

Replace the manual feed
pickup solenoid.

Replace the DC controller
board.

Table 29 No Paper Pickup From Cassette (1 of 2)

Result Action

Is connector P13 on the DC controller
board making good contact?

No Reconnect P13 to the DC

controller board.

Is connector P115 on the cassette
feeder board making good contact?

No Reconnect P115 to the

cassette feeder board.

Is cassette feed solenoid connector
P202 securely connected to the
cassette feeder board?

No Reconnect P202 to the

cassette feeder board.

Is cassette pickup solenoid connector
P201 securely connected to the
cassette feeder board?

Reconnect P201 to the
cassette feeder board.

Remove the paper cassette tray.
Visually inspect the paper sensing
arm. Does the paper sensing arm
appear to be damaged?

Replace the paper
sensing arm.

LaserWriter Select 300/310

Table 29 No Paper Pickup From Cassette (2 of 2)

Se T oto | Reet] ton

Prepare the printer for troubleshooting Replace the cassette
as described in the Troubleshooting pickup solenoid.
Preparation section under

"Troubleshooting the LaserWriter

Select."

Switch off the printer. Connect the
multimeter between P13-7 (+24V) and
P13-8 (/TURN1). Does the resistance
measure between 220 and 240 Q?

Connect the multimeter between
P13-10 (+24V) and P13-11 (/FEED1).
Does the resistance measure
between 110 and 130 2?

Replace the cassette feed
solenoid.

and P13-4 (GND) on the DC controller
board. While removing and inserting
a paper cassette tray filled with paper,
does the voltage toggle from 0 VDC
(inserted) to +5 VDC (removed)?

the cassette feeder tray
cable.

Replace the DC controller board.
Does the problem still occur?

Problem solved.

Replace the cassette
feeder board. If the
problem persists, replace
the expansion feeder
cable.

If an optional paper cassette is
installed, connect a multimeter
between connector pins P13-3 (NO
PAPER2) and P13-4 (GND) on the
DC controller board. While removing
and inserting a paper cassette tray
filled with paper, does the voltage
toggle from 0 VDC (inserted) to +5
VDC (removed)?

If only one paper cassette is installed, Replace the cassette
connect a multimeter between feeder board. If the
connector pins P13-1 (NO PAPER1) probiem persists, replace

LaserWriter Printers, Vol. 2 135

Table 30 No Paper Pickup From Manual Feed or Multipurpose Tray

Step

Check

Result

Action

Is connector P17 on the DC controller
board making good contact?

Reconnect P17 to the DC
controller board.

Is connector P16 on the DC controller
board making good contact?

Reconnect P16 to the DC
controller board.

Disconnect P111 from the high-
voltage power supply. Disconnect
P16 from the DC controller board.
Connect the multimeter between
connector pins P16-7 (PULLUP 5V)
and P16-8 (GND) . Does the voltage
measure +5 VDC when you switch on
the power?

Go to Table 12, Power
Supply Failure (+5 VDC).

Connect the multimeter between
P16-9 (No Paper) and P16-8 (GND).
Does the voltage measure +5 VDC
when you switch on the printer?

Replace the DC controller
board.

Connect the multimeter between
P16-9 and P16-8 on the DC controller
board. Does the voltage drop from +5
VDC to 0 VDC when you place a
sheet of paper on the manual feed
tray?

Replace the manual feed
sensor. If the problem
persists, replace the
manual feed sensor
cable.

Connect a multimeter between
connector pins P17-1 (24V) and
P11-2 (GND) on the DC controller
board. Does the voltage measure +24
VDC when you switch on the printer?

Go to Table 11, Power
Supply Failure
(+24 VDC).

136

Switch off the printer. Connect a
multimeter between pins P17-1 (24V)
and P17-2 (/FEED). Does the
resistance measure between 210 and
230 2?

Replace the manual feed
pickup solenoid.

Replace the DC controller
board.

LaserWriter Select 300/310

Optional feeder
components

B. identical to

main feeder

FG POWER
SUPPLY

SCANNER
AOTOR UNIT

_ INTERLOCK
sw

123 4

i a ee
/ Wik Py

/PREREG
GND
PULLUP 5V

| | /-PULLUP 5V

FUSER ASSEMBLY 123
P120
100-120V 220-240V o
*Pin2 Heater NC PS602 PS201
ee ee ce we tEGISTRATION PAPER DELIVERY
* Pin3 NC Heater SENSOR SENSOR

rWriter Select 300/310
Wiring Diagram

LaserWriter Printers, Vol. 2

137

Personal
LaserWriter 300

Exploded View 140
Parts List 141
I/O and Controller Assembly
Boards 143
Specifications 144
Status LEDs 146
Paper Paths 147
Sensing System 148
Service Test Page 149
Mirror Adjustment 151

Registration Adjustment 154
Troubleshooting the

Personal LaserWriter 300 156
Wiring Diagram lve

18d

os
.)

Exploded View

Cover
Power
Connector
Cover
To
Rear D os .
Door
Assembly
Button
Interface Lock
Connector
Cover Delivery
Roller
Light Assembly
Pipe
Assembly Laser/
Scanner
Fuser Assembly
Assembly
Cover Mirror
Assembly
Fixing
Film Transfer
Assembly Roller
Assembly
Fuser
Assembly Transfer
Mount
Passive Assemblies
Delivery

Rollers > Xa — Fan

Motor Intake
Assembly Guide
Cover Lock
Interlock
Actuator : Chassis
Drive WES P*/ A ya— arm

Assembly Registration

Assembly

Roller
Assembly

/O Board ;
Cover itt
/O Board
Feeder Guide

= Scanner Assembly
A Interconnect

HVT Connector
- A
2 etl Assembly
— Pickup
b Solenoid Controller
or Assembly
ee |
iss) 2 .
S Figure 1 Personal LaserWriter 300 Exploded View
ww
D
oO

140 Personal LaserWriter 300

Parts List

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CHASSIS si Ass vei ulsanenenute tee cacuasnanitas ap eatiguesubnennatenin eeewarectaaedacsecnarncdtetiee 922-0481
Controller ASSEMb|Y (12OV) .......cccccccccccccceeeceeeeeeseeeeeeeeeeeeseeeeeeeeeeeeeees 661-0029
Controller aSSeMbly (Q40V) ........cceeesseeceeeceeeseeeeesseseeeeeseeeeeaeaeseeeeees 661-0028
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Feeder guide ASSEMDIy ...............:::0:::ssseseseeseeeeeeeeeeeeeeeceeseceeeeenseneeas 922-0469
Fixing film ASSEMbly (110OV)...........cccccccccsssssseseeeeeceeeeeeaeneeeeeeeeeeseeeeees 922-0450
Fixing film assembly (220V)............::::::ssssseeseesseeeeeeeeeeeeeeeeeeeeeeeeeeeeees 922-0451
Fuse, 125V, 10A (package Of 10) ...........cccceeececensseeeeeeeeeeeeeeeeenseeaees 922-0484
Fuse, 201V (package Of 10) ..............ccecceccssssseeeeeseeeeeeesseaeaeeeesesseaees 922-0485
Fuse, 250V, 3.15A (package Of 10) ...........cceeseceesesseseeeeeeeeeeereeeeeaeees 922-0486
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FUSEL:ASSOMDLY: (220 V) eiveesanesunor cow sacoacedecsite al edetvnalenvenruntatiunesacectesey: 661-0026
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WOS DO AIG et atassstacedsicunsnaceateas ectuncnsnatactunea der anges paineennanatieameadraeiie 661-0030
Laser/SCanner ASSEMDIY ..............cccccceeeeseesesseeeeeeeeeeeaaaasesereeserenseaenaes 661-0027
LIGHT DIDG:ASSOMIDIY ‘oiuicitdew ers Axctsvavasaeaeddacisbua i Neetans Huh dend ies iearbodaaa’ 922-0465
LOCK (PACKAGE: OFS) wiseciesz Si recsivecwaseeeraceuswiessedpauneadncinadagas tameevenea 922-0473
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Passive Celivery rollers .........cccceccccccsssseeeeeecneeseeeeeesaaseeeeesaaaneeeensnaaaes 922-0467
Pickup motor (PICKUP ASSEMDIY) ......... ee eeeeeeeeeeceeeetereeeeaaeneeeeenseenes 922-0452
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Power cord Cable (Australia) ............ccccccccsseeeeeeeeeeeeeeeeeaeeesereeseeseenanees 922-0493
Power cord cable (Danish) .................::00:000 i cate teaciaduennetel ata taba 922-0495
Power cord Cable (Israel) ..............cccceeceececeeeeeeeeeeeeeeeeeseeeeeeseeeenesaees 922-0496
Power Cord Cable (Uapan)...........cccccccceesssesssseeeeeeeeeeeeeasseeeeeeseeseneneaes 922-0497
Power Cord Cable: (SWISS) vise) ccnedeadesakesssosciersciyegeebincsnseihToanaantiedenttas 922-0494
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LaserWriter Printers, Vol. 2 141

142

Scanner interconnect ASSEMDIy..............cccccceeceeeeeeeeeeeeeeseeeeeseeeeeaeaees 922-0457
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TOD COOK 5 debataccescucns caesieiacosinautasessasicnds maui wo tens ansaunamiunat ann astelesienes 922-0463
Transfer mount assembly (left) ...............ccccsessescccccseeeeeesereesteneeseeeees 922-0477
Transfer mount assembly (right) ................cseeeseccceeeeceeeesesseseeeeeeeeeeess 922-0478
Transfer roller ASSEMDIy .............ccccccccccccecucseeseeseeeeneeseeseeeaseaeueneeeeses 922-0476
Universal CASSCtte 0.0.0... cccccccccsssessesceeceeseeseeeesesaesasecseceeaeesaseseneusees 922-0459

Personal LaserWriter 300

I/O and Controller Assembly Boards

al aed
z
|

fect adage RU wee BPS) wha ee Sheva oe

J1 J
Interface Connector Controller Board Connector
(opposite side)

Figure 2 Personal LaserWriter 300 I/O Board

J204 J103

J201

Solenoid Assembly

oe \ Uallyrs
Pickup a Connector
il

Figure 3 Personal LaserWriter 300 Controller Assembly

LaserWriter Printers, Vol. 2 143

Specifications

Printer Specifications

Print
Resolution

Canon engine

300 dots per inch (dpi)

Speed

Paper Feed

4 pages-per-minute maximum; actual performance depends on the
application

Input: Automatic with universal paper cassette; manual feed
available for special print materials
Output: Face-down or face-up

Print Materials

Paper
Capacities

Cassette feed: 17-20 lb., single sheet, photocopy bond
Manual feed: 17-28 Ib., letterhead and colored stock, standard-
weight transparency material, envelopes, and labels

Capacity in:
Cassette—100 sheets;
Manual—single sheets, envelopes, transparency material, etc.
Capacity out: 25 plain sheets (face-down delivery); transparency
material, labels, and postcard paper are delivered face-up only
and must be removed by hand

Imaging
Language
Supported

Macintosh
Requirements

QuickDraw

Macintosh computer with system 6.0.7 or later

Imageable
Area

Maximum printable lines: 8 in. (203 mm)

Minimum top and bottom margins: 0.25 in. (6.385 mm)
Minimum left and right margins: 0.25 in. (6.385 mm)
Printable area may vary depending upon application

Dimensions

Operating
Requirements

Power
Requirements

144

Height: 6.3 in. (16.1 cm)
Width: 15.2 in. (38.5 cm)
Depth: 14.9 in. (37.9 cm)
Weight: 15.4 Ib. (7 kg) without cartridge

50—-90.5° F (10-32.5° C)
20-80% relative humidity

U.S./Japan: 100-120 VAC; 50-60 Hz
Europe/Australia: 220-240 VAC; 50 Hz

Personal LaserWriter 300

I/O Board Specifications

Processor N/A

4 MB

512K, expandable to 1.5 MB or 4.5 MB
ROM N/A
Interfaces RS-422

Printing QuickDraw

Protocols

Built-in Fonts Avant Garde, Bookman, Chicago, Courier, Geneva, Helvetica,
Helvetica Narrow, Monaco, New Century Schoolbook, New
York, Palatino, Symbol, Times, Zapf Chancery, Zapf Dingbats

LaserWriter Printers, Vol. 2 145

Status LEDs

Note

146

ene ( ) Ready/In Use LED

ae) [> Paper-Out LED

= Sy Paper-Jam LED

Figure 4 Personal LaserWriter 300 Status LEDs

The Personal LaserWriter 300 has three status LEDs (see Figure 4) located on
the top of the printer:

¢ Paper-Out — The red Paper-Out LED is on and steady when the printer is
out of paper or the paper tray is missing and the printer is set for cassette
feed.

¢ Paper-Jam — The red Paper-Jam LED comes on when paper jams inside
the printer. The LED remains on until the jam is cleared.

The Personal LaserWriter 300 has no on/off switch. Once you plug in the
printer, it is on and ready to print.

Personal LaserWriter 300

Paper Paths

Delivery Roller Toner Cartridge

Paper
Delivery
Selector
Fuser Transfer Pickup
Roller Roller

Figure 5 Face-Up Path
Figures 5 and 6 show the two Personal LaserWriter 300 paper paths. Paper

enters from the paper cassette or the manual-feed slot and exits to the face-
down tray or through the face-up delivery slot.

Delivery Roller Toner Cartridge

Paper
Delivery
Selector
Fuser Transfer Pickup
Roller Roller

Figure 6 Face-Down Path

When the paper delivery selector is in the down position (see Figure 5), paper
is delivered face-up. When the selector is in the up position (see Figure 6),
paper is delivered face-down.

Note Default delivery is face-down at the top of the printer.

LaserWriter Printers, Vol. 2 147

Sensing System

148

The Personal LaserWriter 300 has four paper sensors (see Figure 7). Each
sensor consists of an actuator and a U-shaped photo interrupter that is
soldered to the controller assembly. The paper sensors are actuated when an
arm or lever swings against the paper as the paper moves through the printer.

oO")
PS301

Figure 7 Sensing System

The paper delivery sensor, PS301, detects the passage of paper through the
fuser assembly. The registration paper sensor, PS302, detects the presence of
paper in the manual-feed slot and detects misfeeds of both cassette-fed and
manual-fed paper.

The winding paper sensor, PS303, detects the passage of paper from the

photosensitive drum to the fuser. The cassette empty sensor, PS304, detects
whether the cassette tray contains paper.

Personal LaserWriter 300

Service Test Page

The Personal LaserWriter 300 service test page, which consists of a series of
vertical lines, confirms print engine operation. To print a service test page,
follow these steps:

1. Remove the printer cover.
2. — Install a toner cartridge and fill the paper cassette tray.

Note You must install the toner cartridge before you plug in the printer, or a
paper jam may occur.

Plug in the printer and switch it on.

Defeat the paper delivery sensor, PS301, with a piece of folded paper, as
shown in Figure 8. Insert the paper only until it touches the metal shaft
of the fuser. If you insert the paper too far, the sensor remains open and
the printer determines that a paper jam exists.

Figure 8 Defeating the Paper Delivery Sensor

LaserWriter Printers, Vol. 2 149

Toner

/ Cartridge

<-
= <a
JR xs Cover

Interlock
—<we Actuator

Figure 9 Printing a Service Test Page

5. Cover the toner cartridge with a piece of paper to prevent exposure of
the drum.

6. Press down on the toner cartridge and the cover interlock actuator (see
Figure 9) while you press the service test page button with a screwdriver.

Note When you press down the cover interlock actuator, the fan should come on
and the paper delivery rollers should rotate. If you don't hear the fan, verify
that you have properly defeated the paper delivery sensor, that you are
holding down the cover interlock actuator all the way, and that the paper
cassette is installed.

Note If you do not press down firmly on the toner cartridge during the printing
process, the test page may be blank.

150 Personal LaserWriter 300

Mirror Adjustment

The reflecting mirror is factory-adjusted to ensure the correct angle. If you
replace the mirror or the laser/scanner assembly, you must readjust the mirror
as follows:

1, Align the adjustment scale on the mirror assembly with the mark on the
printer chassis, as shown in Figure 10.

Mark on
Printer
Chassis

Figure 10 Aligning the Mirror

2. Load the printer with letter-size paper and initiate a service test page as
described in the "Service Test Page" section.

3, Using a straight edge, draw a line across the top of each vertical line on
the service test page. Place a triangle against the first vertical line on the
service test page and trace its top edge, as shown in Figure 11.

LaserWriter Printers, Vol. 2 151

Leading Edge of Paper

Line 1
T08 | Triangle

Line 2

Figure 11 Tracing the Service Test Page

Measure the error between line 1 and line 2, as shown in Figure 12.

Measure
here

Figure 12 Measuring the Adjustment Error

If the error is more than 1.5 mm, shift the scale in 1 mm increments to
correct the error. Shift the mirror towards the laser/scanner to move the

left side of the image up; shift the mirror away from the laser/scanner to
move the right side of the image up (see Figure 13).

152 Personal LaserWriter 300

Adjustment Scale

Adjustment Scale on Mirror

Adjustment Direction:

Image Right U

Laser/Scanner Unit

Figure 13 Readjusting the Mirror Alignment

Initiate a service test page to verify the adjustment. If the adjusted value
is still incorrect, repeat this entire procedure until the error is less than

1.5 mm.

153

LaserWriter Printers, Vol. 2

Registration Adjustment

You must adjust the printer registration whenever you replace the controller
assembly. The optimum registration is 2 mm, as shown in Figure 14.

Figure 14 Optimum Registration

, mm Leading Edge
Registration
Distance

If the printer registration is off, you can adjust it as follows:

1. Using a jeweler's screwdriver, reset VR301 on the controller assembly to
"0" (see Figure 15).

VR301

Figure 15 Resetting VR301

154 Personal LaserWriter 300

2. Switch on the printer and wait for it to warm up.

3. Print three service test pages.

4. Measure the distance from the top of each page to the edge of the
printed test pattern.

5. Calculate the average distance by adding the three measurements and
dividing by three.

6. Adjust VR301 so that the average value becomes 2.0 mm. For example, if
your average distance is 2.6 mm, the difference is 0.6 mm and you should
set VR301 to a setting of -2 (see Figure 16).

7. Print three more test pages. If the average registration distance is not 2.0
mm, repeat this procedure.

(+) Clockwise (-) Counterclockwise
(Avg. distance < 2.0mm) (Avg. distance > 2.0mm)

Difference | VR301 Difference | VR301
(mm) Setting (mm)
-

Figure 16 Determining the Proper VR301 Setting

LaserWriter Printers, Vol. 2 155

Troubleshooting the Personal LaserWriter 300

156

The flowchart directs you to perform various tasks and refers you to specific
troubleshooting tables. Perform each step in the troubleshooting tables in
order until the problem is resolved and refer as necessary to the wiring
diagram that follows the tables.

Pre-Power-On Checklist

Verify that the following conditions are met before proceeding with the
troubleshooting flowchart or tables:

e — Line voltage is OK (115 VAC + 10%).

¢ — Printer is installed on a solid, level surface.

¢ Room temperature is between 50—90° F (10—32.5° C).

¢ Humidity is 20-80%.

e — Printer is not located in a hot or humid area, near open flames, or in
a dusty location.

e Printer is not exposed to ammonia gas.

¢ — Printer is not in direct sunlight.

¢ — Printer is installed in a well-ventilated area.

¢ — Cables and connectors are OK.

e Toner cartridge is installed and has toner.

e — Paper cassette is properly loaded with paper.

¢ — Paper is within specifications.

¢ — Top access door is closed.

¢ — Rear door assembly is closed.

Personal LaserWriter 300

Troubleshooting Tips

Following are tips for troubleshooting the Personal LaserWriter 300.

Drum Exposure

When the printer cover is removed, the photosensitive drum inside the toner
cartridge may be exposed to light. Exposing the toner cartridge to light (even
room light for more than 5 minutes) can damage the cartridge and may result
in blank spots or black stripes on printed pages. To avoid such exposure,
follow these guidelines:

Don't leave the rear access door open on the printer when the toner
cartridge is installed.

Always cover the toner cartridge when you remove it from the printer.
Avoid storing open toner packages in areas that are exposed to direct
sunlight.

Always cover the toner cartridge with a piece of paper when printing with
the printer cover removed.

Note If the cartridge has been irradiated by ordinary light, you may be able to repair
the damage by placing the cartridge in a dark area, such as a drawer, for several
hours. However, do not expose the cartridge to direct sunlight.

Avoiding Paper Jams

Follow these guidelines to reduce your chances of a paper jam:

Don't load already printed pages into the paper cassette—always use
manual feed for printing the second side of two-sided copies.

When printing multiple pages via manual feed, wait for the screen
prompt before inserting a new sheet into the printer.

Make sure that the paper cassette is properly loaded with one of the
recommended paper types.

Always install the toner cartridge before plugging in the printer.

LaserWriter Printers, Vol. 2 157

Printing with the Cover Removed

When printing test pages with the printer cover removed, you must press
down on the toner cartridge to ensure contact between the HVT connector
assembly and the contact points on the toner cartridge. If you do not apply
proper pressure during the print cycle, vou may get blank pages.

158 Personal LaserWriter 300

Personal LaserWriter 300 Troubleshooting Flowchart

START

Do
you have a
Macintosh computer
with the LaserWriter 300
driver installed
available
for testing?

. Connect the printer to the Macintosh computer that is
using the LaserWriter 300 driver.

. Open the printer and remove any paper jams.

. Install the toner cartridge and fill the cassette tray.

. Switch on the computer and plug in the printer.

Does the
fan come
on?

Go to Table 1,
No Power to Fan.

Does the
main motor rotate
during
startup?

Go to Table 2,
Main Motor Failure.

Issue a Print Window or
Print Desktop Command.

Personal LaserWriter 300 Print Engine Check (1 of 3)

LaserWriter Printers, Vol. 2 159

Follow the instructions
given in the error message
that appears on the
Macintosh screen. If the
message indicates a module
malfunction, replace the
module.

Does the
printer print from
a Macintosh?

Is the print
quality
OK ?

Go to Figure 17,
Print Quality Problems.

The printer is fully functional.

Personal LaserWriter 300 Print Engine Check (2 of 3)

160 Personal LaserWriter 300

Remove the printer cover and I/O board.
Remove any paper jams.

Install the toner cartridge and fill the cassette tray.
Plug in the printer.

Defeat paper delivery sensor PS301 with a piece of
folded paper (see Step 4 under "Service Test Page.")
Cover the laser/scanner assembly with a piece of
paper to prevent exposure to light.

Press and hold down on the toner cartridge and the
cover interlock actuator.

Sb. Oy Ole oh

Does the
fan come
on?

Go to Table 1,
No Power to Fan.

Does the

main motor rotate Go to Table 2,
during Main Motor Failure.

startup?

Initiate a service test page.
(See "Service Test Page.")

Does the
printer deliver
a service test
page ?

Go to Table 3, 4, 5, or 6,
depending on the specific
paper transport problem.

Is ict Go to Figure 17,
‘on ty Print Quality Problems.

The printer is fully functional.

Personal LaserWriter 300 Print Engine Check (3 of 3)

LaserWriter Printers, Vol. 2 161

Important

Troubleshooting Tables

As you proceed through the steps in a table, remember to retry the

printer each time you change its physical state—such as when you
replace a module. If the problem remains, reinstall the original
module before proceeding to the next step in the table. Refer as
necessary to the wiring diagram that follows the tables.

Table 1 No Power to Fan

Check

_ Result |

Action

Make sure the toner cartridge is
_ installed and then unplug the printer.
' Due to the possibility of a capacitor

the printer. Does the problem
| persist?

| error, wait 4 minutes and then plug in |

| Problem solved.

_ ls the printer cover securely seated
| and the rear door assembly installed

is removed, do you have the cover
| interlock actuator depressed and the
' paper delivery sensor defeated?

}

_and securely closed? Or, if the cover |

: Reseat the printer cover

_ and/or install and close the
| rear door assembly. Or,

| depress the cover
Interlock actuator and

| defeat the paper delivery

| sensor.

_ Is there correct voltage at the outlet?

Plug in the printer at an

outlet that is supplying the
| correct voltage.

_ Is the printer's power cord securely
| connected at the outlet and at the
_ printer end?

' Secure the power cord.

Is the fan cable securely connected to
| the laser/scanner assembly?

}

tab that secures the fan to the
| chassis?

' Is the fan cable pinched under the top |

| Secure the fan cable.

| Make sure the fan cable
| runs under the side of the
| tab.

Does the voltage between connector
J804-3 (FANON) and J804-1

' (+12VGND) on the laser/scanner
assembly change from 0 V to about

162

|
' Is fuse FU101 on the controller
_ assembly blown?

| 12 VDC when you plug in the printer? |

' Replace the fan.

| Replace the fuse.

Replace the controller
assembly.

Personal LaserWriter 300

Table 2 Main Motor Failure

Step

Check

Is the motor properly seated and
making good contact with the
controller assembly?

LaserWriter Printers, Vol. 2

Result

Action

Reseat the motor so that it
makes good contact with
the controller assembly.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

¢ Replace the motor.

e Replace the controller
assembly.

163

Table 4 No Paper Pickup From Manual-Feed Slot

Is the printer set up for manual feed? Select the Manual Feed
option in the Print dialog
box.

Try printing with known-good paper. Problem solved.
Does the problem persist?

Remove excess paper from the Problem solved.
manual-feed slot. Does the problem
persist?

Is the arm registration assembly Replace the arm

broken? registration assembly.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

e Replace the pickup
motor.

e Replace the controller
assembly.

¢ Replace the fuser
assembly.

LaserWriter Printers, Vol. 2 165

Table 5 Paper Jams in Pickup/Transfer Area

: Check _ Result ! Action

| Try printing with Known-good paper. No | Problem solved.
; Does the problem persist? ! |

Was the toner cartridge installed No | With the toner cartridge

| before you plugged in the printer? | installed, unplug the

| | printer and plug it back in
again.

(
_

‘Is the paper wrinkled or damaged? | Check the inside of the

| | printer for physical
obstructions and make

| sure that all paper feed
assemblies are installed
| correctly.

Inspect the arm registration | | Replace the arm
assembly. Is itjammed or broken? | registration assembly.

Does the paper jam when you printa | | Replace the fuser
service test page? assembly.

| Replace the pickup motor.
If the problem persists,
replace the controller

| assembly.

166 Personal LaserWriter 300

Table 6 Paper Jams in Fuser/Delivery Area

Check

Try printing with known-good paper.
Does the problem persist?

Is the paper wrinkled or damaged?

Inspect the winding paper sensor on
the feeder guide assembly. Is it
jammed or broken?

Inspect the delivery roller assembly
and passive delivery rollers. Are they
installed correctly and in good
working order?

Remove the rear door assembly and
inspect the operation of the paper
delivery selector. Does the assembly
move freely?

Test the paper delivery sensor in the
fuser assembly. Does it appear to be
jammed or broken?

LaserWriter Printers, Vol. 2

ia Problem solved.

Check the inside of the
printer for physical
obstructions.

Replace the feeder guide
assembly.

Replace or reseat the
delivery roller assembly
and/or passive delivery
rollers.

Replace the rear door
assembly.

Replace the fuser
assembly.

Replace the controller
assembly. If the problem
persists, replace the fuser
assembly.

167

Blank Page All-Black Page Light/Faded Image Dark Image

See Table 7 See Table 8 See Table 9 See Table 10
elles ‘ L. ] Av
Black Vertical White Vertical Irregular Stairstepping
Line(s) Line(s) Black Line See Table 14
See Table 11 See Table 12 See Table 13
Horizontal Black Horizontal Bad Registration Skewed Print
Banding Lines See Table 17 See Table 18
See Table 15 See Table 16
rie
Bad Fusing Toner on Back Blank Spots
See Table 19 See Table 20 See Table 21

Figure 17 Print Quality Problems

168 Personal LaserWriter 300

Table 7 All-Blank Page

Action

cartridge free from any other
obstructions?

the toner cartridge.

Has the sealing tape been removed Remove the sealing tape
from the toner cartridge, and is the or other obstructions from
No

If the printer cover is removed, make Problem solved.
sure you are pressing down on the
toner cartridge during the printing
process so that the toner cartridge is
making solid contact with the HVT
connector. Does the problem

persist?

Are the metal contact points on the Clean the contact points
toner cartridge or HVT connector with a soft, dry cloth.
assembly dirty?

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

¢ Replace the controller
assembly.

¢ Replace the
laser/scanner assembly.

Table 8 All-Black Page
|

1 Replace the controller assembly with No Problem solved.
a known-good controller assembly.
Does the problem persist?

Replace the laser/scanner
assembly.

LaserWriter Printers, Vol. 2 169

Table 9 Uniformly Light/Faded Image Over Entire Page

| Result | Action

Remove the toner cartridge and rock © No Problem solved.
it back and forth to distribute the toner - |
evenly. Does the problem persist?

Adjust the print density via the | Problem solved.
_ Options button in the Print dialog box, | |
and print about a dozen test pages
with known-good paper. Does the
problem persist?

Replace the toner cartridge with a | | Problem solved.
known-good cartridge. Does the |
problem persist?

Are the metal contact points on the | Clean the contact points

170 Personal LaserWriter 300

Table 10 Uniformly Dark Image Over Entire Page

Adjust the print density via the Problem solved.
Options button in the Print dialog box,

and print about a dozen test pages

with known-good paper. Does the

problem persist?

Are the metal contact points on the Clean the contact points
toner cartridge or HVT connector with a soft, dry cloth.
assembly dirty?
Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
¢ Replace the controller
assembly.
e Replace the
laser/scanner assembly.

Table 11 Black Vertical Lines, co and Well-Defined

Rand printing with a ee... -good toner pee —7) solved.
cartridge. Does the problem persist?

Does the problem only occur when Replace I/O board.
you print from the Macintosh (that is,
the problem definitely does not occur Perform the first module
on service test pages)? exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
e Replace the fuser
assembly.
¢ Replace the
laser/scanner assembly.

LaserWriter Printers, Vol. 2 171

Table 12 White Vertical Lines, Sharp and Well-Defined

Check

Action

Is there any type of physical
obstruction near the laser opening
that could be casting a shadow on the
photosensitive drum?

| Remove the obstruction.

Does the problem occur only when
you print from the Macintosh (that is,
the problem definitely does not occur
on service test pages)?

| Replace the I/O board.

Perform the first module

exchange listed below. If

the problem persists,

reinstall the original

module and perform the

next exchange:

e Replace the pickup
motor.

¢ Replace the
laser/scanner assembly.

e Replace the mirror
assembly.

Table 13 Vertical Banding, Irregular and
Smudged Black Lines Over Image

Check

Result

Action

172

Replace the toner cartridge. Does
the problem persist?

Problem solved.

Personal LaserWriter 300

Is the laser/scanner a...
properly seated and making good
contact with the scanner interconnect
assembly?

Table 14 — Lines Jagged or Shaky

Reseat the laser/scanner

assembly.

Is the scanner interconnect assembly
properly seated and making good
contact with the controller assembly?

Does the problem appear when you
print a service test page?

Yes

next exchange:
¢ Replace the

assembly.

Table 15 Horizontal Banding, Evenly Spaced
Smudged Black Lines Over Image

Check Result Action

Interrupt a print cycle and inspect the
photosensitive drum. Does the fault
appear on the drum?

LaserWriter Printers, Vol. 2

Reseat the scanner
interconnect assembly.

Replace the I/O board.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the

laser/scanner assembly.
¢ Replace the controller

Replace the toner
cartridge.

Replace the fuser
assembly.

173

Table 16 Black Horizontal Lines, Sharp and Well-Defined

Step Check Result Action

| Are the lines evenly spaced?

Replace the toner
cartridge.

Replace the laser/scanner
assembly.

Table 17 Bad Registration

Try printing with known-good paper.

Does the problem persist?

Remove the excess paper from the
cassette tray or manual-feed slot.
Does the problem persist?

Perform the registration adjustment
(see "Registration Adjustment").
Does the problem persist?

174

Result

Action

Problem solved.

Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:

¢ Clean or replace the
pickup roller as needed.

e Replace the pickup
motor.

e Replace the arm
registration assembly if
broken.

¢ Replace the controller
assembly.

Personal LaserWriter 300

Table 18 Skewed Print

Adjust the mirror assembly (see Problem solved.
"Mirror Adjustment"). Does the
problem persist?

Table 19 Bad Fusing

Try printing with dry, known-good Problem solved.
paper. Does the problem persist?
2

Clean the transfer roller using dry, Problem solved.
lint-free paper only. Does the
problem persist? Perform the first module
exchange listed below. If
the problem persists,
reinstall the original
module and perform the
next exchange:
e Replace the fuser
assembly.
e Replace the transfer
roller.

LaserWriter Printers, Vol. 2 175

Table 20 Toner on Back of Page

Check

Result

Action

Clean the transfer roller using dry,
lint-free paper only. If the roller
cannot be cleaned, replace it. Does
the problem persist?

Problem solved.

Clean the transfer guide assembly.
Does the problem persist?

Clean the feeder guide assembly.
Does the problem persist?

Problem solved.

Replace the fuser
assembly.

Table 21 Blank Spots, Random Pattern or Location

Check

Result

Try printing with Known-good paper
and be sure to print on the correct
side of the paper if applicable. Does
the problem persist?

Action

Problem solved.

Clean all the metal contact points on
the toner cartridge and on the HVT
connector assembly. Does the
problem persist?

176

Problem solved.

Perform the first module

exchange below. If the

problem persists, reinstall

the original module and

perform the next

exchange:

e Replace the transfer
roller assembly.

e Replace the controller
assembly.

Personal LaserWriter 300

FAN +12VGND
FANTAC -
FANON -

SCANNER
INTERCONNECT
ASSEMBLY

FUSER ASSEMBLY

PICKUP MOTOR
ASSEMBLY

Ce ee

Actuator

Registration
Solenoid

Fixing
Film i

=
=

ierWriter 300
Jiagram

LaserWriter Printers, Vol. 2

Apple Computer, Inc.
2()525 Mariani Avenue
Cupertino, CA 95014 Printed in the U.S.A.
TLX 171-576 072-0632

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